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Introduction, Names A–F,
Names G–L, Names M–R,
Names S–Z, Areas A–E,
Areas F–G, Areas H–R,
Areas S–Z,
First names,
Stamp Forgery Guide.
Copyright Š 2010 G. Kock
| Signature/name | Expertizing area | Details (b.=born, d.=dead, f.=founded) |
| A (in blue): correct postage | Belgium and Colonies (postal history) | See Soeteman, additional marks |
| A (resembling CA, in circle) | Ukraine | See Breul |
| A under crown | Czechoslovakia | See Sula |
| A3.boka (Az. Voka) | Russia (Armies and areas), Azerbaijan | See Az.Voka |
| Abonyi, Jenö | Hungary, Fiume (forged) | Budapest 1949, dealer, [Flasch] |
| Abraham | Hungary (Szeged etc.) | [Flasch] |
| Abt, Walter | Switzerland incl. hotel posts | Thun (CH), Basel, BPP 1980, SBPV |
| AC (monogram) | Czechoslovakia | See Cerny, Antonín |
| AC (or CA, in circle) | Poland (Cracow 1919) | See CA |
| ÁcsJenö (Acs). Note | Hungary, Fiume | Dr. Jenö Ács, 1920s, forged, [Flasch] |
| Ad. Glaettli, Zürich | British East Africa | See Glaettli |
| Adam & Söhne (= sons) | Germany | Germany, dealers |
| Adamczyk, Janusz | Poland | Kraków 2000, Polish Fed. |
| Adgey-Edgar, Capt. Walter Herbert | Japanese occ.s Malaya and Burma, Manchukuo, Tibet | Great Britain, 1887–1977, philatelist. Note. BPT WhoWasWho |
| Adler, Arthur | Germany (Bizone incl. Bauten) | Grebendorf, BPP 1961 |
| AE | Germany, Turkey, Worldwide | See Arthur Ernst Glasewald |
| AF (in manuscript) | Finland? | See Freymuth |
| AG (in manuscript) | Finland, Russia, Baltics | See Fabergé |
| Agadjan, F. | Caucasia, Russia | See Arcadjan |
| Agaogullari, Ziya | Turkey | Turkey, Turkish Phil. Fed. 2001 |
| AgF | Finland, Russia, Baltics | See Fabergé |
| Aginelli, E., Torino, 2 | Italian States | See Asinelli |
| Aguirre, Eduardo (in square) | Latin America | Mexico DF 1926 1949, dealer, forged |
| AHL (in 2 lines in circular box) | Germany (Upper Silesia) | A suspect mark |
| AIEP | Worldwide | Association Internationale des Experts en Philatélie, Zurich, f. 1954 |
| Aigner, Dr. | . | VÖB a.o. member |
| Aisslinger, Horst | Worldwide (air mails) | Aalen, 1925–92, BPP 1976, AIEP 79–92 |
| AJ | Austria (1945 overprints on Germany) | . |
| AK (upper case script) | Turkey | See Kicukis |
| AK (in circle) | Ukraine | See Koliski |
| Aksamit, Pavel | Czechoslovakia | Czech Rep., b. 1942, SCF 2004– |
| Alcalde, P. | Spain (Civil War) | . |
| Alcuri, Paul J., 2 (pencil). Certif. | Worldwide (pre-1900) | Canterbury (GB), dealer 1945– |
| AL (or LA) (monogram) | Ukraine | . |
| ALL | Russia (areas), Ukraine | On forged |
| Allegeershecque, André le Jeune d' | Belgium | Brussels, 1922–99, [Soeteman] |
| Allen, T(homas) ('TA') | Br. Colonies | London 1926, 1895–1984, dealers. Note |
| Althen, Manfred | Germany (Allenstein) | Bad Vilbel, BPP 1991 |
| Altmann | German States | On forged, forged |
| Altstädter, Dr. | Yugoslavia (SHS) | [Flasch] |
| Alvarez, Ricardo | Costa Rica, Central America | San José, 1912–2003, dealer, AIEP 1982–2000, As Fil de CR 2001 |
| Alver, Heldur | Estonia | Sweden, in use c. 1970–80 |
| Amano, Yasuharu | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Ambroz, O. | Yugoslavia (SHS) | Eszék (Hungary), a forger, [Flasch] |
| Amend, Günther | Spain and Colonies | Hamburg, BPP 1961 |
| Ames, Norman | Russia, Soviet Union | Swindon 2001, Br. Soc. of Russian Phil. |
| Anbeisser, J. H. | Worldwide | Cologne 1897 |
| Andersen, Hans | German States (Schleswig-Holstein); German occ. Kurland | Flensburg 1950, 1882–1965, BPP 1961 |
| Anderson, Spencer ('S.A.') | USA | USA |
| Anderssen, Dr. Justus | Norway | Norway 1929, up to 1950s |
| Anduze, Garanti: P. | Latin America | Paul Anduze; forged |
| Angelides, Antoine | Turkey | Istanbul, pre-WW2, dealer |
| Angeloglu (Angeloglous), E. L. ('ela'). Picture. Advert. | Egypt, Saudi Arabia, etc. | Cairo 1905 1926 1943, b. 1878, dealer. Note |
| Anon | Hungary | Alias Szabó, on forged, [Flasch] |
| Antoniazzo, V. (Vincenzo?) | Fiume | [Flasch] |
| Antoniu, Jan S. | . | Rumania, 1905–87, AIEP 1967–76 |
| APAI (successor of APA) | Saudi Arabia | See Arabian Philatelic Assoc. Int. |
| APEX (formerly APES) | USA, BNA, Worldwide | American Philatelic Expertizing Service (APS and ASDA), 1903–, [PE]. Note |
| apitz (forged) | Germany | See Opitz |
| appadopulo (in boxed P) | Russia (Siberia) | See Pappadopulo |
| APS | Worldwide | American Philatelic Society, see APEX |
| AR | Germany East (1945 locals Grabow) | See Rodewald |
| Arabian Philatelic Assoc. Int. Certif. | Saudi Arabia | APAI, expertising service. Cf. King. |
| Arbeit, Marcel | Czechoslovakia (postal stationery) | Czech Rep., SCF 2005– |
| Arcadjan (or Agadjan(ian)), F. | Armenia, Azerbaijan, Georgia, Russia | Paris?, on forged |
| Arctander | Denmark | . |
| Arechavala, Graciliano | . | Madrid, 1907–57, AIEP 1954–57 |
| Arenz, Dr. Hartmut | Germany (1945–6 locals) | Cologne, BPP (1991) until 2005 |
| Argyropoulos, Alexander G. (A. ΑΡΓΥΡΟΠΟΥΛΟΣ). Photo | Greece, Epirus, Ikaria, Ionian Is. | Athens 1949, 1883–1962, dealer |
| Arikan, Arman. Photo | Turkey | Istanbul, dealer (Kamer Arikan), Turkish Phil. Fed. 2001 |
| Arkel, .. W. von, Bremen, 2 | German States, Colonies and PO abroad, Ukraine | Bremen, dealer |
| Arnold, Alwin | Ukraine | Berlin-Wilmersdorf, b. 1878, UPV, BPP 1935, [UPNS] |
| Arsman, N. Cengiz. Photo | Turkey | Turkey, b. 1940, Turkish Phil. Fed. 2001 |
| AS (monogram) | Ukraine | See Stohmann |
| ASEP | Switzerland | French for SBPV, q.v. |
| Ashbrook, Stanley B. (m.scr.) | USA, Confederate States | Cincinnati 1926, 1882–1957(58?) |
| Asinelli | Italy and States | See Colla Asinelli |
| Asinelli, E., Torino, 2 | Italian States | Turin, dealer |
| Atheneu | Portugal | . |
| Aufdruck falsch | German area (mainly) | German for "Forged overprint" |
| Aune, Finn | Norway | Vollen (Norway), b. 1955, dealer, expert 1989–, AIEP 1997–, [FFE3, PE] |
| Avi, Dr. Helmuth. Certif. | Italy and States, Italian Colonies, San Marino, Vatican | Lugano 2002, SBPV |
| Avia Lopez, Jaime | Spain | COMEX 1996 |
| AW | Hungary | See Walder |
| Az.Voka (A3.Boka) | Russia (Armies, areas), Azerbaijan | Probably Azerbaijan Philatelic Association, also on forged |
| Aznar Havana Cuba | Cuba | Also on forged |
| B (in circle, manuscript) | Hungary (Debrecen), Rumania (Regatul) | See S. Bayer (Galatz), [Flasch] |
| B (actually JB) (monogram) | Ukraine, Western Ukraine | See Baumgarten |
| Babor, Gerhard | Austria | Vienna 2001, b. 1952, auctions (Dorotheum), VÖB, AIEP 2004–, [FFE8] |
| Bach, Jean Paul | Worldwide | Basel, b. c. 1953, dealer 1981–, member of BPB 1999, q.v. |
| Bach, Ludwig | Saar (Mi 226I–238I, 1947) | Saarbrücken 1949, dealer. |
| Bacon, Sir E(dward) D(enny). Certif. | Worldwide | London, 1860–1938, RPSL Exp. Comm. BPT WhoWasWho |
| Baete, J(ean) (in italics, violet) | Belgium | Brussels, 1919–97, AIEP 1971–97, [Soeteman] |
| Balasse, Guy | Belgium and Colonies, Worldwide (pre-1900) | Brussels 1999, [Soeteman]. Note |
| Balasse, Willy (in italics (forged!), red or black German style C in rectangle, or in manuscript) | Belgium | Brussels 1943 1961, 1906–92, dealer, AIEP 1952–92 |
| Ballschmidt, Günter. GB (?) | Germany East (Bezirk 1948) | Essen, Berlin 2002, BPP 1976 |
| Banater Philatelist ('PhB', qv.) | Hungary (Debrecen; on genuine) | A Temesvár magazine, [Flasch] |
| Banks, Barry | USA, BNA, Br. Colonies | Ogden Utah, Empire Philatelics, Profess. Stamp Experts 2000 |
| Bar, Julij ('J3ar'). Certif. | Yugoslavia | Ljubljana 1941, expert c. 1955–80 |
| Barabassy, Nicolaus | Hungary | Frechen (DE), BPP 2000– |
| Baranya II Tevny. (in metal) | Hungary (Baranya errors) | See [Flasch 56], forged in rubber |
| Bargagli-Petrucci, Count Filippo | Italian States (Tuscany) | Firenze, 1926–84, dealer, AIEP 1954–84 |
| Bärsch, Jürgen (Barsch) | Saar (Official Mi 1–32) | Wiesbaden, BPP 1996 |
| Bartels | Estonia, Switzerland etc. | Hamburg, dealer, in use c. 1950–70. Note |
| Bartels, J(ohn) M(urray) | Worldwide | Am. Phil. Ass. expert early 20th century |
| Barth, Norbert | Germany (1945–6 certain locals) | Wegberg 2005, BPP 2005– |
| Baschwitz, Germán | Spain | Madrid, CEM 1996, BPP 2001 |
| Basel, Briefmarkenprüfstelle | Europe, Worldwide | See Briefmarkenprüfstelle Basel |
| Basika, Karel | Czechoslovakia | Czechoslovakia, 1903–68, SCF |
| Bates, Richard | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Bátori (Artur Emil Batori) | Hungary (Debrecen etc.) | Budapest, dealer, a good mark, [Flasch] |
| Baudot, Jean-François (manuscript) | France | Bourges (France) 2001. Note |
| Bauër, Henry | German States (NDP (Alsace-Lorraine)) | Strasbourg 1926, dealer |
| Baumgarten, Josef, 2 (cf. [Flasch]), 'JB' (monogram). Note | Western Ukraine, Ukraine, Hungary | Vienna 1920s, dealer, also on forged |
| Bayer (manuscript) | Iceland | . |
| Bayer (S. Bayér) | Hungary | Galatz (Rumania), dealer, [Flasch] |
| Bazant, Andreas | Austria | Vienna 2001, b. 1961, dealer, VÖB |
| BBB (in two lines, also in circle) | Russia (areas), Ukraine | On forged. Cf. Ernst |
| BBB (in three lines) | Hungary (ovpt) | On genuine, [Flasch] |
| BBB (within a triangle) | Korea (Kingdom/Empire) | . |
| Beal, James H. | Mexico | Ohio, 1922–87, APS |
| Beaufond, Edgar Huyghes de | France | Paris 1943, 1886–1964, dealer. Note |
| Bechtold, Günter (forged) | Germany (Infla incl. Official) | Weilheim, b. 1930, expert 1984–, BPP 1991, AIEP 1991–2001, [FFE3] |
| Beck, Charles | Luxembourg | Luxembourg 1950 |
| Becker, Ing. Ernst (forged). (Ing. = Engineer) | German States (Prussia), Germany (Berlin, Bizone 1948), Germany East (OPD Meckl.-Vorp.), German occ.s Poland (GG) and Kurland, Lithuania, Central Lithuania, Memel | Anklam 1935, Hamburg 1950, 1894–1971, BPP 1961, AIEP 1954–71 |
| Becker, G. ('G. Becker–Echt') | Poland | Poland pre-WW2, dealer. Mostly on forged [Stallberg] |
| Beckhaus, Walter | Germany (postal stationery?) | Berlin, BPP 1961 |
| Beeck, Edmund van der | Russia | Moscow 1897 |
| beetle (picture of) | Germany (and several related areas) | See Dub, Dr. Emil |
| Behr, Bernard | France | Paris, b. 1924, dealer, expert 1954–, AIEP 1974–, [PE] |
| Behr, Georges | France and Colonies | Paris, b. 1893, founded the shop in 1920 |
| Behr, Pascal Olivier | France and Colonies | Paris, b. 1962, dealer, expert 1991–, AIEP 2001–, [FFE6, PE] |
| Behrens, 2 (for use on Propaganda Forgeries), advert. | Worldwide | Walter B., d. 1950, dealers, Braunschweig, also on forged, [Flasch] |
| Behrsin, Alfred | Russia (NW Army) | Pskov (Pleskau), 1920s |
| Belasco, Steven R. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Belgian Congo Study Circle. Certif. | Belgian Congo | Belgium |
| Bellenger, Gerard | France | Normandy 2000, status uncertain |
| Bellion, P. | France, Europe | Paris 1943, dealer |
| Bene, Frantiek (Benes) ('Pofis-Bene') | Czechoslovakia, Bohemia & Moravia | Prague 2001, b. 1955, dealer (Profil), SCF chairman |
| Bene Sr., Frantiek (Benes) | Czechoslovakia (postal history) | Prague, b. 1931, dealer (Profil) |
| Benol | Czechoslovakia | Dealer's or owner's mark. [Hoffmann] |
| Benussi, Ruggero | Fiume, Yugoslavia (1918–41) | Bolzano, 1924–2004, expert 1948–2003, AIEP 1964–2003, [FFE6] |
| Benzinger, Prof. Heinz | China (Empire), Shanghai | Munich, BPP 1980 |
| Berbeka, Janusz | Poland | Poznan 2000, Polish Fed. |
| Berck, Edouard. Mark? | France | Paris 1961, c. 1900–94, dealer, AIEP 1954–94 |
| Berger, Ant. | Luxembourg | Luxemburg 1897 |
| Berger, Florian. Certif. | German States | Limburg, b. 1939, dealer, BPP 1980 |
| Berger, L. | German States (Brunswick) | Braunschweig 1897 |
| Berger, P. E. (two sizes) | Turkey, Poland? | . |
| Bergua, Enrique Soro | Spain and Colonies | See Soro Bergua, Enrique |
| Berlingin, René | Belgium | Ham-sur-Heine 1935 1950, dealer |
| Bernardelli, Renzo | . | Italy, 1905–75, AIEP 1960–75 |
| Bernichon, Jules, Paris. (Jules Anthoine) | French Colonies, Malaya, Turkey, etc. | Paris, d. 1911, dealer, mark forged by [Wondelgem] |
| Berntsen, Arnstein | Norway | Oslo, d. 1980? |
| Berra-Gautschy, Rémy. Certif. | Switzerland | Monthey (CH), b. 1931, expert 1972–, AIEP 1985–, SBPV, [FFE3, PE] |
| Beskow, Bernhard | Iceland | Stockholm, dealer (Frimärkshuset) |
| Bessels, Giel J. | Netherlands Indies | Netherlands 2001, BKD expert, [FFE4] |
| Bettin, L. (or I.) | Italy | . |
| BÉVI (in circle) | Hungary (ragasztó = forged) | Budap., expert comm., active, [Flasch 60] |
| Bialek, Henryk | Poland | Warsaw 2000, Polish Fed. |
| Bialikamien, Enrique. Photo | Costa Rica | San José, Asoc. Filat. de C.R. 2001 |
| Bianchi | Russia | John Bianchi (see below), or B. Bianchi, Geneva, both dealers, up to 1940s |
| Bianchi, Ennio. Certif. | Italy | Milan 2001. Note |
| Bianchi, John | Switzerland (Cantons and Rayons) | Zurich-Zollikon 1926 1950, (see above) |
| Biermann | Ukraine | Germany, collector, on genuine, [UPNS] |
| Biesecke, Franz | Denmark, Iceland, Norway, Germany | Berlin 1950, 1888–1966, BPP 1961 |
| Bifani, Giorgio | Italy esp. Italian Social Republic | Brescia 2009 |
| Billig, P., Wien | Ukraine | Not Fritz Billig? |
| Binner Norden, Erich | Heligoland | Wilhelmshaven 1950, d. 1956 |
| Biondi, Gino. Certif. | Italy and States | Firenze 2001, dealer. Note |
| Birnbach, Heinrich | Rumania (1866–72) | Berlin, b. 1872 |
| Birnbaum | German States | Note |
| Biró, Marcel (see the scans) | Hungary | Debrecen, see [Flasch 63] |
| Bísek, Jirí | Worldwide (air mails) | Praha, expert 1974–2002, SCF 2001 |
| Bishop, Rex D. | German Colonies, Greece, Japan | Boonton NJ (USA) 2001 |
| Bisk, Alexander | Russia and areas, Ukraine | New York NY, dealer |
| BKD, Bondskeuringsdienst. Certif. | Netherlands and Colonies | Dutch Federation's Expertising Service, f. 1922, [PE] |
| Blaha, Dr. Miroslav (in script) | Czechoslovakia, Carpatho-Ukraine | Skalitz, Zabreh (CZ), 1921–93. Note |
| Blanc, Robert (metal hand stamp) | France and Colonies | Paris 1943, dealer |
| Blecher, Friedrich Wilhelm. Certif. | Germany (NDP, Alsace-Lorraine) | Essen, Winterberg, 1924–2000, BPP 1976, AIEP 1976–98 |
| Bloch, Herbert J., 2 (manuscript). Certif. | Worldwide, Poland (Cracow 1919) | New York NY, 1907–87, expert 1950–87, AIEP 1956–87. Note |
| Blomberg, Erik | Sweden | Stockholm 1961 |
| BM (inside map outline) | CSA, USA (Tennessee postal history) | See Matz |
| Bobecka, Vladimir | . | Rumania, b. 1921, AIEP 1958–62 |
| Bochmann, Dr. Eugen von | Russia | Riga, 1836–1901 |
| Böcking, Jean (Bocking, Boecking), J. B. | Saar | Saarbrücken, 1873–1925, expert c. 1920–25, the JB mark has been forged [Wilhelm van Loo] |
| Boden, Erich | German Colonies | Braunschweig 1950, b. 1878 |
| Bodor, Dr. Mihály | Hungary (occ. and local issues) | Pécs 2006, [Flasch]. Note |
| Boeck Parada, Eugenio von | Bolivia | Bolivia, b. 1923, [FFE3 6] |
| Boekema, Roelf | Netherlands and Colonies | The Hague, 1904–97, dealer, BPP 1961 |
| BOG ERT DUR BIN (one letter on back of each stamp in sheet) | USA (Providence RI reprints) | Bogert & Durbin Co, New York NY 1898, dealers |
| Bogquet | France | . |
| Bohdan, J., 'J.B.' | Ukraine | Rumania, on forged |
| Böheim, Dr. Julius (Boheim) | Germany East (Bezirk 1948) | Konstanz, BPP 1991 |
| Bohne, Dr. Werner M. Note | Germany incl. all areas | Longwood FL, 1920–1998, AIEP 1985–98 |
| Bojanowicz, Miroslaw A. | Poland incl. locals | Rome 1949, later Wembley (GB), 1906 or 1907–86, dealer, BPP 1961, AIEP 1961–86. Note |
| Boker, John R., jr. | USA | USA, b. 1913, Philatelic Foundation |
| Bokvaj, Milan | Europe, Scandinavia (postal history) | Prague, SCF 2001 |
| Bolaffi, Alberto (jr.) | Italy and States | Turin, b. 1936, son of Giulio, dealer, expert 1975–, AIEP 1983–, [FFE5, PF] |
| Bolaffi, Alberto (sr.) | Italy and States | Turin, 1874–1944 |
| Bolaffi, Dr. Dante | Italian States | Turin, 1908–88, son of Giulio, AIEP 1976–88 |
| Bolaffi, Dr. Giulio (manuscript). Certif. | Italy | Turin 1961, 1902–87, son of Alberto sr., AIEP 1954–87 |
| Booleman, M. Z. | South Africa | Amsterdam 1897 |
| Booleman, W. R. | Ukraine | Netherlands? |
| Borek, 2, 3 | Worldwide | Richard B. (Sr.), 1874–1947, dealers f. 1893, in Braunschweig, [Flasch] |
| Born, Carl | Worldwide | Leipzig 1897 |
| Bortfeldt, Dieter | Colombia | Bogotá, b. 1940, expert 1994–, AIEP 2002–, [FFE6, PE] |
| Boskovic, Zoran (ZB), 2 (in use 2005–). Certif. | Yugoslavia (certain former areas, see note) | Belgrade, b. 1957, expert 2001–, Phil. Assoc. Serbia & M. Note |
| Bossert, H. W. Certif. | Switzerland | Basel 2005, independent expert |
| Bothe, Hans (forged twice) | Germany, German Colonies incl. GRI | Berlin-Tempelhof, deceased, BPP 1961 |
| Bottacchi, Giacomo F. | Italy (1862–78), Italian States (esp. Sardinia) | Milan, b. 1962, auction agent, expert 1986–, AIEP 1999–, [FFE3, PE] |
| Boule, Maurice | Monaco, Italy, France, Worldwide | Monaco 2002, Paris 1999, b. 1943, dealer, expert 1987–, AIEP 2002–, [FFE6, PE] |
| Bouvet, Dr. Pierre | France | Paris 1943. Note |
| Bowen | Iceland | . |
| Bowman, James W. | Confederate States | Lubbock TX 2000 |
| BPA. Certif1, 2 | Br. Colonies, Worldwide | British Philatelic Association, f. 1928, [PE] |
| BPB | Europe, Worldwide | See BPBS |
| BPP. Meaning of the position of marks. Homepage | Germany (incl. all areas), Europe, Worldwide | Bund der philatelistischen Prüfer, Germany, f. 1958 |
| BPSB, Briefmarkenprüfstelle Basel | Europe, Worldwide. Also on forged | Basel, expert committee. Note. Certif. |
| Brainard (in script) | Worldwide | Christopher E. B., New Jersey, dealer (B&S Stamp Bourse), [Flasch] |
| Brandes, W., 2 (in script) | German States and Colonies | Probably: Willi B. Jr, Berlin 1943, dealer |
| Brandon, David. Certif. Note | Great Britain, Br. Colonies | Guildford, dealers, independent experts |
| Braunstein, Ilia | Worldwide (air mails) | Brussels, 1909–80, AIEP 1970–80 |
| Brekenfeld, Carsten | German Carolines, Cameroun and Togo | Berlin, BPP 2001 |
| Brettl, Cornelia | German States (Bavaria air mails), Heligoland | Vaterstetten, BPP 2004– |
| Brettl, Maria | German States (esp. Bavaria, air mails), USA (pre-WW1), Argentina (Corrientes) | Vaterstetten, b. 1930, expert 1964–, BPP 1968, AIEP 1968–, [FFE3, PE] |
| Brettschneider, W. | Australia | Melbourne 1897 |
| Breul, Arno(ld), 'A' (in circle) | Ukraine | Gera-Zwötzen 1950 1961 |
| Brevi | Hungary | [Flasch] |
| Briefmarkenprüfstelle Basel | Europe, Worldwide | See BPBS |
| Bringmann, Dr. Wolfgang | German States (Prussia) | Berlin, BPP 1991 |
| Bristow, Mercer | Worldwide | B. 1951, APS Dir. of Exp., [FFE3] |
| Brooks | Hungary (Szeged) | . |
| Brooksbank, Randall | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Brudeseth, Ĺge | Norway | Norway 1999 |
| Brugger, Guido | Germany (Mi 1–30) | Meckenbeuren, BPP 1996 |
| Bruhl, Emil | Estonia | Tallinn, expert c. 1930–60 |
| Brun, Aimé. Photo. Note. Advert. | France and Colonies, Worldwide | Paris 1926, 1887–1969, dealer 1926. Note 2 |
| Brun, Jean-François. Photo. Note | France and Colonies | Paris, b. 1943, expert 1970–, BPP 1984, AIEP 1970–, [FFE2, 3 (p. 167) 6, 7, PE] |
| Brunel, Robert | German occ. WW2 Balkans and Sudetians | Mauerstetten, BPP 2001– |
| Brunner, F(elix) | Czechoslovakia (Posta 1919), Austria | [Flasch], (q.v. Am. Phil. Congr. Book 1944: b. 1893) |
| Brunner, Joh. | German States (Bavaria) | B. 1874 |
| Brys, J. (in black) | Belgium | John B., [Soeteman] |
| bsb | Czechoslovakia | See Skandera |
| BSC (in German type) | Hungary | [Flasch] |
| BSRP | Russia and areas | British Soc. of Russian Philately. Note |
| Buchbinder, Dr. Med. Jürgen. (Used to mark forged stamps as such.) | Poland (Przedborz) | Bad Sassendorf? c.2000, a specialist collector |
| Buchsbayew, Dr. Paul | Russia, Soviet Union | New York NY, b. 1952, Cherrystone Auctions, expert 1986–, AIEP 1992–, NFF, [FFE5, PE] |
| Buchta, Eduard | Czechoslovakia | Czechoslovakia, 1911–77, SCFS |
| Budapester Bg. Börse | Hungary (Szeged) | [Flasch] |
| Bühler, Georg (+forged twice). Certif. Ads. (Buhler, Buehler) | Germany and States, Europe, South America and Worldwide (all pre-1900), Br. Colonies | Berlin, auctioneer 1931–, dealer 1943, expert, BPP 1961. Note |
| Buijs, H. H. | Netherlands Indies | Tegal (Neth. Indies) 1897 |
| Bukvic, C., Kr. Vinohrady | Czechoslovakia | Prague-Vinohrady, dealer |
| Bulat, H. (in Cyrillic script; also in Latin script), Bulat BPP | Ukraine, Carpatho-Ukraine, Western Ukraine, Poland | John Bulat, Yonkers NY, d. 1999, BPP 1976 |
| Bulkley, Jonathan | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Bungerz, Alexander | German occ. Libau; Latvia, etc. | Vienna, 1874–1931 |
| Büning, Paul (Buning, Buening) | Greece | Wiesbaden 1950 |
| Buranasombati, Pichai (Works as member of committee.) | Thailand | Thailand, b. 1944, expert 1999–, AIEP 2003–, [FFE7, PE] |
| Burgdorf, W. | Iran (Persia) | Bremen 1961 |
| Burger, Alfred (forged) | Saar (Mi 1–52) | St. Ingbert 1997, BPP 1980 |
| Burger, Ernst | Israel, Palestine | Cologne-Lindenthal, 1921–83, BPP 1968, AIEP 1978–83 |
| Burhop, Dedo | Germany East (OPD 1945, Bezirk 1948) | Butjadingen (Germany) 2003, dealer |
| Burillo, Antonio | Spain | CEM expert 1996 |
| Burneleit, Albert | Germany (Infla colours) | Berlin 1942 1961 |
| Busch, Werner | Germany, Turkey | Berlin-Wilmersdorf 1950 |
| Busse, Joachim | Germany East (Bezirk 1948) | Reichling 2003, BPP 1984 |
| Bustillo, Larry | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Butikofer, Fréd | Europe | Pully (CH), d. 1978, AIEP 1954–74 |
| Butler, A(rthur) Ronald | Colonies in Australia | West Worthing (GB), 1916–2003, AIEP 1978–2003, Past Chairman RPSL Exp. Comm., [FFE1 2 4] |
| Byram, J. | Ukraine, Western Ukraine | See Bulat, John (the Cyrillic mark) |
| C in German style in rectangle, red or black | Belgium | See Balasse, Willy |
| CA (monogram) | Czechoslovakia | See Cerny, Antonín |
| CA (or AC, in circle) | Poland (Cracow 1919) | [Scan: Slawomir Sejda] |
| CA (in circle) | Ukraine | Reported to be Breul, q.v. |
| CA, einf. CA, CA CA. (einf. = single) | Br. Colonies | CA or Multiple CA Watermark, (not an expertising mark) |
| Caffaz, Egidio Primo. Certif. | Italy and areas | Padova 2001, dealer. Note |
| Cajal Mora, Antonio | . | Madrid, 1905–87, AIEP 1954–75 |
| Cajal Ońate (Onate), José Antonio | Spain | Spain, b. 1933, CEM expert 1996, AIEP 1971–74. Certif. |
| Calhoun, Col. Richard L. | Confederate States | Chicago 2000, CSA |
| Calves, R(oger) (in script (often worn); and in manuscript) | France and Colonies, Europe, Worldwide | Paris, b. 1921, dealer, AIEP 1960–99, BPP 1984 (no longer). Note |
| Cammaerts, Roger | Belgium | Belgium 1999, [Soeteman] |
| Cancellation removed | Worldwide | Stamp's cancellation has been removed |
| Cancelled to order (CTO), 2, 3 | Worldwide | "G" means printed cancellation |
| Capill, Colin G. | New Zealand | NZ, RPSNZ Exp. Comm., [FFE1] |
| Capouch, Stanislav | Austria (–1918) | Prague, SCF 2001 |
| Caran, Dr. Mirko | Yugoslavia and areas | Belgrade 2004, Phil. Assoc. Serbia & M. |
| Carion, Georges. Advert.1, Advert.2 | France and Colonies (ovpt.s) | Paris 1926, dealer, forger and 'expert', advertised in 1909, [Tyler; Brühl p.492] |
| Carlsson, John (advert. for) | Sweden | Kalmar, collector or dealer |
| Caro, Erwin | Israel | . |
| Carraro, Gianni. Certif. | Italy | Milan 2001, dealer. Note |
| Caspary, Alfred H. | Worldwide (pre-1940) | New York NY, 1877–1955, PF |
| Cartel, Dr. | Saar | Or Bartel, Dartel, Gartel? |
| Cassinie, G. | Egypt | Alexandria, dealer |
| Castle, M(arcellus) P(urnell) | Worldwide | England, 1849–1917, RPSL |
| Cattani, Adriano | Italy (pre-adh.) | Padova 2005, dealer |
| CEH CO | Latin America | See Hussman |
| Celler, Dick | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| CEM | Spain and Colonies | Comisión de Expertos de Madrid. Note |
| Ceremuga, Krzysztof (Chris) | Australia (Cmwth), Papua, New Guinea, Togo (1914–18), Samoa (1914–18) | Sydney, b. 1973, expert 1994–, AIEP 2001–, [FFE3, 5, PE] |
| Ceresa, Dr. R. J. in green, often smudged; RJC (note) | Russia and all areas, Armenia, Azerbaijan, Georgia | Raymond J. Ceresa, England 2001, expert 1977. Note |
| Cerny, Antonin, 'CA' | Czechoslovakia | Prague na Újezde, dealer, pre-WW2 |
| Cerruto, Giorgio (manuscript) | Italian States (Sardinia), Italy (Kingdom & Socialist Rep.) | Brescia 1988, b. 21.8.1922 |
| Chalot | France and Colonies | Paris dealer Chagot? |
| Champagne, David | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Champagne, Richard | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Champion, Th(éodore), 2?, 3?, (also a winged wheel twice, in violet) | Worldwide | Paris 1926, 1873–1954, dealer 1902 |
| Chan, Dr. Shiu-Hon | China incl. all areas, Hong Kong, Macau | Hong Kong 2004 |
| Chang Min | China | Hubei, b. 1952, [FFE3] |
| Charlat, L. W. | Panama Canal Zone | . |
| Cherniavsky, Dr. Ivan, 'JCz' | Western Ukraine | Kolomyya, [Bulat] |
| Chesloe, Charlie | Czechoslovakia | Willow Springs IL USA 2002, dealer (Tribuna Stamp Co.), Tribuna Expert Committee |
| Chevalier, Jean | France | [Thomas Berger, CH] |
| Chevassu, Dr. Maurice | France | Paris 1949, (1877–1957 ?). Note |
| Chiavarallo, Dr. Giovanni. Certif., 2 | Italy and States, Albania | Naples 2001. Note |
| chicken (picture of) | Luxembourg | . |
| Chile, Sociedad Filatelica de. Certif. | Chile | Comisión de expertos, Santiago |
| Chomiak, Maksym | Ukraine | Canada, collector |
| Chvalovský, Josef | Czechoslovakia | Praha, SCF 2001 |
| Cividini, Dragutin (?) | Rumania etc. | Croatia of today (if same person) |
| Cividini, Jean, Paris | France, Austria etc. | Paris, dealer, c. 1910–60, not reliable [cf. Sperati II, Tyler] |
| CKBIP | Ukraine | See Skweir |
| Clark, Peter | German occ. Channel Is., Great Britain (Lundy), Propaganda forgeries | Düsseldorf, Sanderstead (Surrey), BPP 1961 |
| Clercq, Leo De | Belgium | Belgium, FRCPB expert 1970–, [FFE1] |
| CM | Russia (areas) | On forged |
| CŘA (Russian for 'SFA') | Russia, Soviet Union | See Soviet Philatelic Association |
| Cock, André-Emile de | Belgium (cancellations) | Brussels, 1880–1964, BPP 1961, AIEP 1954–64 |
| cogwheel | Nicaragua | . |
| Cohen Sabban, Albert | France (1900–) | Paris, b. 1945, dealer, expert 1980–, AIEP 2000–, [FFE4, PE] |
| Cohring, F., Berlin | Ukraine | Berlin, dealer |
| Colic, J. V. (Jerko V.) | Yugoslavia (Croatia) | Zagreb during WW2 |
| Colla(-Asinelli), Dr. Giorgio. Certif. | Italy and States | Turin, b. 1946, expert 1977–, AIEP 1984–, [FFE1 3 4, PE] |
| Collins, Commander F(rank) W(illiam) | Cape of Good Hope | Winchester (GB), c. 1907–89, AIEP 1967–89 |
| Colson, Warren H. ('W.H.C.') | USA (provisionals), Hawaii | Boston, 1882–1963, dealer |
| Comelli, Paulo | Brazil | Belo Horizonte, b. 1943, AIEP 2003–, [FFE7, PE] |
| Comerma | Spain | A Catalan name? |
| COMEX. Note | Spain and Colonies, Andorra | Comisión de Expertos Filatelicos, Barcelona, f. 1965, [PE] |
| Commission Belge d'Éxpertise | Belgium | Brussels 1950 |
| Cooper, Jal (manuscript) | India | Bombay, famous dealer –1970s |
| Coptoir Central | Albania (Korce) | On forged |
| Corette, Tom | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Corneille (in red). Note (3) | Belgium and Colonies | See Soeteman |
| Cosmopoulos, L. (in script), 2 | Greece and areas | Greece? 1973 |
| Costales, Eugene N. Note | USA | New York NY, 1894–1984, dealer 1926 |
| Costantino, E. | Worldwide | Probably a US collector's mark |
| Coughlin, Ray L. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Coutinho Vieira, Maria Isabel | Portugal and areas | Portugal 2005, Inexfip apprentice |
| Cowitt, Richard I. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Crha, Frantisek | Czechoslovakia | Czech Rep., b. 1931, expert 2004– |
| Critikian - Madrid | Spain | Renato (René) C., Madrid 1943, 1908–91, dealer, AIEP 1954–c.56 |
| Croatian Philatelic Association | Yugoslavia | Zagreb |
| Cronin, Andrew | Russia, Carpatho-Ukraine, Mongolia | Toronto, b. 1925, AIEP 2000–, [FFE1 4 (p.174) 5, PE] |
| Crowe, William T. (Works as member of committee.) | USA, US Possessions | New York NY, b. 1947, expert 1973–, PF, AIEP 1999–, [FFE5, PE] |
| crown over A | Czechoslovakia (Posta 1919) | See Sula, Jaroslav |
| CS (in red). Note (3) | Belgium and Colonies | See Soeteman |
| CSA | Confederate States | Confederate Stamp Alliance. Note |
| Csaba | Hungary | On forged [Flasch] |
| Csepreghy (= Lajos Csepregi?) | Hungary | Budapest 1943, dealer, [Flasch] |
| CSS. Certif. only | China and related areas | The China Stamp Society Inc, MO, USA |
| CTO | Worldwide | See cancelled to order |
| Cueni, Dr. Werner. Photo | Switzerland, Czechoslovakia, Estonia, Europe, Worldwide (air mail ovpt.s) | Basel 1949, 1897–1955, official expert 1949, AIEP 1954–55 |
| Cunliffe, Robert | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Curinaldi, Dr. | Yugoslavia (ovpt Bosnia) | Luigi von Curinaldi (Alois Kurinaldi), 1908 ? |
| Cuvelier, M. | Morocco | Paris 1943, dealer |
| CW (in oval) | Finland | See Wasenius |
| CW (in square) | Ukraine | See Shramchenko, [UPNS] |
| CWR | Ukraine | See Roberts |
| Czechoslovak Philately, Society for | Czechoslovakia | USA |
| Czencz, Dr. Sándor, 'DrCzS.' | Hungary (Sopron 1956) | Hungary, [Flasch] |
| Czimmek, Ulrich | German South West Africa | Düsseldorf, BPP 1991 |
| d (in circle) | Germany, etc. | See Pfarrer Dieckelmann |
| D (in blue): genuine perforation | Belgium and Colonies | See Soeteman, additional marks |
| D | Germany | See Herrmann Decker |
| D | Germany and areas | Reported to be a mark of Dr. Dub, q.v. |
| D (Cyrillic letter, 'Д') | Russia and areas, Ukraine | See Davidoff |
| Dadkah, Dr. Mohamed | Iran (Persia), Br. occ. Bushire | Teheran, 1910–80, AIEP 1970–80. Note |
| Daebel, Roland | Iceland | Wensickendorf, b. 1951, BPP 1991 |
| Dahmann, Kurt | Worldwide (air mails) | Berlin-Wilmersdorf 1961, b. 1915 |
| Dahnke, Kurt H. Certif. | Tibet, Chinese PO Tibet | Nuremberg, BPP 1976 |
| Dalston, Thomas | Worldwide | England, b. 1845 |
| D'Ambrosio, Susan | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Daniel, Frantisek | Russia and Soviet Union (air mails) | Czechoslovakia, 1912–94, SCSF |
| Dannenbaum | German States (Brunswick) | Essen 1935 |
| Darmietzel, Peter | Czechoslovakia, Bohemia & Moravia | Marktsteinach, BPP 1996, SCF 2001 |
| Darteyre | Peru | Maybe Didier Darteyre, France |
| Davidoff, 'D' (Cyrillic letter, 'Д') | Russia and areas, Ukraine | A Russian General, on genuine, [UPNS] |
| Davis, Trevor (Works as member of committee.) | Australia, Colonies in Australia | London, b. 1940, dealer, expert 1980–, AIEP 2001–04, Brandon Exp. Comm., [PE] |
| Debney, Richard | Cape of Good Hope | New York NY 2001 |
| Debo, Dr. Arno | Denmark, Danish WI, Faroes, Greenland, Iceland, Germany (Hapag) | Heidelberg, Munich, 1921–2000, BPP 1958–, AIEP 1967–2000 |
| Decker, Hermann ('D'). Note | Germany | Hannover, dealer, expert 1880–, replaced genuine with forged 1897 [GSM 1897–8] |
| Declercq, Leo | Belgium | See Clercq, Leo De |
| de Cock, André-Emile | Belgium | See Cock, André-Emile de |
| Deilakis (script), 2 (caps.) | Greece, Eastern Rumelia | Paris, pre-WW2, dealer |
| del Mazo, Jorge S. | Argentina | See Mazo, Jorge S. del |
| del Tarre, Francisco | Spain | See Tarre, F. del |
| Delapierre, R(obert) (also 'R.D.' ) | Belgium | Belgium 1966, 1891–1970, [Soeteman] |
| Delgado, José | . | Madrid, c.1880–c.1970, AIEP 1954–c.56 |
| Dellavalle, Lorenzo | Italy and States | Turin, b. 1938, expert 1984–, AIEP 1991–, [FFE5, PE] |
| dem | Hungary | [Flasch] |
| Dempwolff, Bernhard | Norway | Mainz-Hechtsheim, BPP 1968 |
| Demuth, René | Luxembourg | Bridel (Lux.), b. 1920, expert 1973–99, BPP 1980, AIEP 1973–2003, [FFE4] |
| Deutsche Kinderpost Amt I | Worldwide | "German Children's Post Office I" |
| Deyhle & Co, Robert | Switzerland (Cantons) | Bern, dealers, experts 1880– |
| DG (in manuscript) | Saudi Arabia | See Graham |
| Diaz Paulos, Fausto | Uruguay | Montevideo, b. 1927, expert 1980–2002, AIEP 1980–2003, [FFE3] |
| d (in a circle) | Germany, etc. | See Pfarrer Dieckelmann |
| Dieckelmann, Pfarrer (d (in circle)) | Germany, etc. | Germany, dealer or collector |
| Diena, Alberto. Certif. | Italy and States | Rome 1950, 1894–1977, expert 1941–, AIEP 1954–77, son of Emilio |
| Diena, Emilio | Italian States | Rome, 1860–1941, expert 1921– (1897?) |
| Diena, Dr. Enzo. Certif. Note | Italian States, Italy and Colonies, Italian occ.s and PO abroad, Trieste, Vatican, Germany | Rome, 1927–2000, expert 1950–, AIEP 1975–2000, BPP 1980, son of Alberto, [FFE3] |
| Diena, Mario | Italian States | Rome, 1891–1971, AIEP 1954–56, son of Emilio |
| Diena, Raffaele. Certif. | Italy and States | Rome 2000, son of Enzo, expert 1993– trading as Enzo Diena s.n.c. |
| Diepenbroek, Willem J. | Ukraine | Bussum (Netherl.) , purchased Dr. Seichter's collection, BPP 1980 |
| Dietrich, Artur | German Colonies and States (Saxony), Heligoland, Europe (pre-1900) | Leipzig 1950, Büttgen 1976, BPP 1961 |
| Dietrich, Horst | Afghanistan | Kaarst, 1923–2004, BPP 1980, AIEP 1976–2003 |
| Dillemann, Paul (manuscript) | France | France, 1886–1936 |
| Dimitrijevic, Vukadin | . | Nis (Serbia) 2004, Phil. Ass. Serbia M. |
| Dobbert, Karl-Heinz | German field post in Turkey | Berlin, 1912–90, BPP 1980 |
| Dobin, Manfred | Russia (pre-adh.) | St. Petersburg (Ru), b. 1925, expert 1991–, AIEP 1995–, [FFE4, PE] |
| Domar | Poland (Cracow 1919) | Poland |
| Dorogi Bp. | Hungary | Budapest, a collector's mark, [Flasch] |
| Doszkár, Emil | Hungary | Hungary, dealer |
| Doubleday, Ron | Pakistan (ovpt on India) | Great Britain 2004 |
| Dr. Cz S. | Hungary (Sopron 1956) | See Czencz |
| Dr. P. Jem | Russia (areas). | See Jemtschoujin |
| Dr. Ps. | Germany etc. | See Paul Sachse |
| Dr. P. Sz. | Hungary | See Szilágyi |
| Dr. Sz. | Rumania (Regatul), Hungary (Debrecen) | See Szalay |
| Dr. U J (in circle) | Hungary (Arad) | Seen on genuine stamps, [Flasch] |
| Drahn, August Wilhelm, A. W. Drahn | Germany (pre-1918), German States, Great Britain and Colonies, Italy and States, Switzerland, Austria, Netherlands, Spain and Colonies, Portugal, Rumania, Luxembourg, Monaco, Bulgaria, Turkey, Europe (pre-1900), Russian PO Levant, Uruguay, Worldwide (pre-1900) | Cologne 1943 and 1961, Bad Kissingen 1950, 1893–1974, dealer, Michel catalogue consultant (for pre-1918 listings), BPP 1958–, AIEP 1954–74 |
| Drazan, Vladimir | Czechoslovakia | Czech Rep., b. 1941, expert 2004– |
| Dreyfus, Alain | France | The Mulhouse dealer? |
| Droese, Bernhard ('B. Droese') | Denmark, Norway, Finland, Germany (1945 Flensburg local), Albania | Plön/Holstein 1950, Düsseldorf 1961, Bad Salzuflen 1968, BPP 1958– |
| Drossos, Pandelis J. (ΔΡΟΣΟΣ) | Greece, Epirus, Ikaria, Ionian Is. | Athens 1949, 1900–1996, dealer 1926 |
| Dsenis | Russia, Ukraine | See Dzenis |
| Dub, Dr. Emil, 2 (beetle, 3 versions), also 'D' for Saar? Also forged. | German occ.s and field posts WW2, Slovakia, Danzig, Italian occ. Fiumano-Kupa, Saar, Germany (Bizone 1948, Berlin), Germany East (OPDs), Austria (post-1918) | Oberstein 1950, 1883–1976, expert 1920–, BPP 1958–, AIEP 1954–74. Note |
| Dubel, Dr. (forged) | . | Germany 1960s |
| Dubus, Léon | . | France, 1894–1981, AIEP 1974–81 |
| Dujmic, Zdravko(?) | Yugoslavia | Zagreb, c. 1950–75 |
| Dumaine, Robert F. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Dünnebier, Dr. Herbert | Saar | Saarbrücken 1949. Note |
| Düntsch, Dr. Gerhard (Infla Berlin) (forged) (Duentsch) | Germany (Infla incl. Official) | Berlin-Lichterfelde, BPP 1961 |
| Duron, Dr. | Central America | Dr. Raúl Durón Membreńo, Tegucigalpa; forged |
| Duscha, Walter | Ukraine | Germany, b. 1903?, in Ukr. during WW2 |
| Dvorácek, Ladislav. Photo | Europe (pre-1900) | Prague, b. 1923, expert 1962–, AIEP 1969–, SCF 2001, [FFE5] |
| Dvorák, Frantisek | Austria, Czechoslovakia | Czechoslovakia, b. 1914 |
| Dy (in circle) | Hungary | [Flasch] |
| Dzenis, 2 (or Dsenis or Dzynis?) | Ukraine, Russia | Dzenis was a forger, cf. Dzynis |
| Dzynis Riga | Ukraine | Riga, dealer, usually known as Dzenis, produced ovpts using stolen devices |
| E (in blue): genuine essay | Belgium and Colonies | See Soeteman, additional marks |
| E. St. b. | Russia (areas) | See St. b., E. |
| eagle (head of) + expertising number | Austria | See Weiss, H. |
| EAH | Finland | See Hellman |
| Earée, Rev. Robert Brisco | Worldwide (not reprints, ovp, Indian st.) | Cheltenham, 1846–1928 |
| EB (complex) | Estonia | See Bruhl, Emil |
| Ebel (in script) | Europe | Arnold E. (owner Benno Krell), Frankfurt, auctions |
| Ebnet, Christian | Russia, Soviet Union | Kamenz, BPP 1991 |
| Echt (in German style) | Russia (areas) | See Jemtschoujin |
| Echt im Block geprüft Infla Berlin (+forged twice) (boxed). Note | Germany (Infla 1923) | See Infla Berlin |
| Echt Infla Berlin (+forged twice) (in circle) | Germany (Infla 1923) | See Infla Berlin |
| Eckardt, Dr. Moritz | German States (Thurn & Taxis) | Garmisch-Partenkirchen 1950, BPP 1961 |
| Eckhardt, W. J. | Worldwide | US (?) forgery collector's mark |
| Eckstein | Czechoslovakia | See Ekstein |
| Economist | Worldwide | Economist Stamp Co (Edward Stern et al.), New York NY 1926 |
| ECM (?) | Poland (Przedborz) | . |
| ECPM | Japan | Expert Committee of the Philatelic Museum Foundation, Tokyo Japan. Note |
| Edgar, Capt. W. H. Adgey | Malaya and Burma (Japanese Occup.) | See Adgey-Edgar |
| Egtc (or Egte or Eqtc) | Fiume | . |
| Ehret, Dr. Karl Th. | German States (Baden) | Sinsheim-Ehret 1935, Freiburg 1950 |
| Eibenstein, Hubertus | German Cameroun and Togo (excl. GRI) | Berlin, BPP 1982–2005 |
| Eich | Germany (field post WW2) | Germany |
| Eichele, Martin | Worldwide | Basel, dealer (Philaclassica) 1985–, member of BPB, q.v. |
| Eichenthal (tall and narrow capital letters). Note | Estonia | Tallinn, used by the Eichenthal stamp store |
| Eichenthal (letters in a circle), Eichenthal (in two lines) | Estonia, Russia (areas) | Ewald E., Södertälje (Sweden) 1950, prev. Tallinn, dealer, circular mark in use 1920–30s |
| Eichenthal (low ordinary capital letters). Forged, note | Estonia, Latvia | Willem E., Kreuzwertheim a.M 1950, Stockholm 1961, prev. Tallinn, b. 1892, expert until early 1970s |
| Eichhorn, Florian. Note | Japan (excl. occ.s), Korea | Wiesbaden, b. 1958, BPP 1983– |
| Eid, A(lbert) | Saudi Arabia, Turkey, etc. | Alexandria or Cairo (1949). Note |
| einf. C. A. (einfach = single) | Br. Colonies | See CA |
| Eisold, Lothar | Russia, France | Lahr (form. Dresden), 1930–2002, BPP 1990–2002 |
| EK in circle and downward arrow | Hungary etc. | [Flasch] |
| EKA | Germany (Marienwerder) | On forged |
| Ekstein, V., Vinohrady | Czechoslovakia | Prague-Vinohrady, pre-WW2, dealer |
| EL | Poland (Cracow 1919) | . |
| ela | Saudi Arabia | See Angeloglu, E. L. |
| Elbau, Peter | Austria, Hungary, Rumania; (all –1918) | Fürstenau 2002, SBPV 1993– |
| Eldrup, Ebbe. Certif. | Iceland | Rungsted kyst (Denmark) 2001. Note |
| Eliades, Christa (forged) | Germany (Berlin) | Berlin, BPP 1996 |
| Elicabe, Ricardo E. | Argentina | Buenos Aires Philatelic Society |
| Eliot | Albania | Sir Charles Eliot? |
| Ell, J(oseph) | Portugal | Lisbon 1950, 1883–1957, AIEP 1954–57 |
| Elliott N.Y. | Worldwide (air mails?) | New York NY, dealers |
| Elmhurst Philatelic Society | Mexico | See MEPSI |
| Elo, Hannu | Finland (fancy cancellations) | Tampere, b. 1948, Finn. Phil. Fed. 1990– |
| Emmel, F. | Germany (Infla), German States (Wurttemberg Official Mi 101–) | Stuttgart-Untertürkheim, BPP 1961 |
| Emery, Prof. Dr. W. O. | USA incl. locals | Crawfordsville (USA) 1897 |
| Engel, R. F., (also Fa R. F. E.) (Robert) | German States (Saxony, and others), Heligoland | Hamburg 1897 1943, dealer, father of W. Engel |
| Engel, Walter, 2 (BPP), (both forged) | Germany and States (esp. Hamburg), Chile (first issue), Non-European (pre-1900) | Hamburg, 1914–82, BPP 1961, AIEP 1978–82 |
| Engels | Ukraine | Berlin, UPV |
| Enger, Hans (Johan) | Norway (excl. locals) | Biri (Norway), b. 1944, dealer, expert 1991–, AIEP 1998–, BPP 1995–, [FFE5, PE] |
| Engler, Peter Ernst. Certif. | Turkey | Owingen (Germ.) 1995, indep. expert. Note |
| Englert, Josef | German States (Baden) | Aschaffenburg, BPP 1984 |
| Enigma Stamps | Australia | Dealers |
| Erbig | Epirus | . |
| Ercegovic, Velimir; ('V.E' in circle) Certif1, 2 | Yugoslavia (excl. locals), Italian occ. Yugoslavia, German occ. Yugoslavia | Zagreb, BPP 1980, c. 1970–92, [Flasch] |
| Erdwien, Volker | Danzig (incl. Port Gdansk), Memel | Elze, BPP 1996 |
| Erdödi, Dr. János (in script) | Fiume | Trieste 1943, dealer, [Flasch] |
| Ernst, Adolf, two-line B. B. B. in circle | Carpatho-Ukraine | Europe, later Palo Verde CA (USA), dealer, reported to use B.B.B. in circle |
| Ernst Belgrade, M. | Hungary, Yugoslavia | [Flasch] |
| Erös, Aladár | Yugoslavia (SHS) | Szabadka |
| Errington & Martin, 2. Note | Worldwide | S. Hackney 1926, dealers c. 1920–50 |
| Escalada-Goicoechea, Eduardo (Works as member of committee.) | Spain and Colonies, Carlist Wars | Madrid, b. 1952, dealer, expert 1986–, CEM 1996, AIEP 2000–, [FFE4, PE] |
| Esrefbey (= Esref Bey?) | Thrace | Turkey |
| Esser, Dr. | Hungary | Budapest, dealer, [Flasch] |
| Estoppey, Edouard S. | Switzerland, Europe, USA | Lausanne 1926, dealer, off. expert 1949 |
| Estoppey, Maurice E. | Switzerland, Europe (pre-1900) | Lausanne, 1915–98, dealer, AIEP 1965–98 |
| Estudio 20 | Latin America | Committee of Buenos Aires dealers |
| Evans, Major Edward B. | Worldwide | England, 1846–1922, RPSL 1894–. Note |
| Evans-de Violini, Mrs. Lois M. | Japan | Oxnard CA 2002, ISJP expert. Note |
| Ey, Dr. Eduard | German Colonies & PO, Switzerland | Germany?, 1887–1967 |
| F | Worldwide | Can mean 'Forgery' |
| Fabergé, Agathon ('AgF'), 2, 3. Photo | Russia, Baltics, Finland | Helsinki, 1876–1951, famous philatelist, FFF exp. comm. |
| Fábián | Hungary | Also on forged, [Flasch] |
| Falený | Czechoslovakia | 'Forgery' in Czech |
| Falk, Arthur | Worldwide (Zeppelin) | New York State, dealer |
| Falkowski, Józef | Poland | Warsaw 2000, Polish Fed. |
| Falsch | Worldwide (forgeries) | German for 'Forged' |
| Falsificat, Falso, Falsum | Worldwide (forgeries) | Latin or Spanish for 'Forgery', 'Forged' |
| Faludi, S., Berlin | Ukraine, etc. | Berlin, dealer |
| Fanngi(?), S. | Ukraine | . |
| Farrington, Jeremiah A. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Faux | Worldwide (forgeries) | French for 'Forged', see also Fournier |
| Fekete, Guido | Hungary, Austria | Vienna 1926, dealer |
| Fennia-Post Helsingfors, 2. Advert. | Finland | Helsinki, dealers (Alfons Sundqvist), in use 1930s, Oy Fennia-Post Ab 1920–c.1950 |
| Ferchenbauer, Paul | Worldwide | Vienna 1950 1961 |
| Ferchenbauer, Ulrich, Dr. Certif. | Austria (–1938 incl. PO abroad), Austria (DDSG), Lombardy-Venetia, Rumania, Europe & Worldw. (pre-1900) | Vienna, b. 1941, son of Paul, expert 1975–, BPP 1991, AIEP 1996–, VÖB, [FFE5, PE] |
| Ferrari Fabergé | Worldwide | Item sold on the Ferrary or A. Fabergé auctions (?) |
| Ferreira, A(rmindo) Simoes | Portugal | Lisbon 1926, dealer, [Mi 1935] |
| Ferroud Paris, A. | France and Colonies | Paris, dealers f. 1889 |
| FF (Rumanian monogram) | Rumania (Regatul), Hungary (Debrecen) | See Juretzky |
| FFF | Finland, Europe | See Frim. För. i Finland |
| Fi | Finland | See Filatelia Oy, Ab |
| FI | Hungary | See Floderer |
| Fieandt, Einar | Finland (Aunus) | Helsinki, 1879–36, SF expert |
| Fiecchi, Alfredo E(rmo) | Italy and States, Worldwide (pre-1900) | Milan 1950, 1900–82, BPP 1961, AIEP 1954–82. Note |
| Field, D(avid) (in script) | Russia (areas) | London 1926, 1871–1926, prominent dealer, also on forged. Note |
| Filatelia Garcia | Spain, France | See Garcia |
| Filatelia Madrid | Spain | Same as above? |
| Filatelia Oy, Ab ('Fi') | Finland | Helsinki, dealers (Gunnar Kreipke?), in use 1930s |
| Filatelia Krakow | Poland | See Philatelia Krakow |
| Filatelia Lwow | Poland | See Filatelista Lwow |
| Filatelia San Giusto | Italy, Trieste | See San Giusto, Filatelia |
| Filatelia Sevillana | Spain | Sevilla, dealers |
| Filatelista ... Bratislava | Czechoslovakia | Bratislava, dealers |
| Filatelista Lwow | Russia (areas), Ukraine, Poland (Cracow 1919) | Lwow (then in Poland), pre-WW2, dealers. Mostly on forged [Stallberg] |
| Filatella | Czechoslovakia | . |
| Findeisen, Hans | Germany (1945–6 locals and OPDs) | Worms, BPP 1980 |
| Fischbein, Karl | Fiume | . |
| Fischer Wien VII., H. | Hungary etc. | Vienna, dealer, [Flasch] |
| Fischer Arad | Hungary | Arad (Hungary), dealer, [Flasch] |
| Fischer, Dr. Peter | German States (Bremen) | Scheessel, b. 1937, BPP 1984 |
| Fischer, R. F. | German Colonies | . |
| Fischl, Dr. | Czechoslovakia | Dealer (Reimannová-Sladková), pre-WW2 |
| Fischmeister, Dr., Ladislav | Czechoslovakia | Czechoslovakia, later USA, 1923–2003 |
| Flasch, Dezsö | Hungary (occ. ovpt.s), Rumania (Regatul), Czechoslovakia (Posta 1919), Yugoslavia (SHS), Fiume (ovpt) | Budapest 1998, d. 2006, expert on overprints, [Flasch] |
| Fläschendräger, W.,
Halle Flä, Hall Fl, WF (?) | Germany East (Bezirk 1948) | Werner F., Halle/Saale 1961 |
| Fleck, Vladimir ('V.F.') | Yugoslavia (ovpt.s), Bosnia & Herzegovina, Croatia, Montenegro, Serbia | Zagreb, 1885–1969, expert c. 1940–69, AIEP 1958–69 |
| Fleiner, Udo | Germany (1916–45) | Stutensee-Büchig, BPP 2001 |
| Fleming | Germany (pre-1900) | . |
| Flemming, Wolfgang (forged) | German States (Baden, NDP, Prussia) | Leipzig, BPP 1991 |
| Flierl, Harry C. | Worldwide | Buffalo, APS expert (chairm. 1942–54) |
| Floderer, István ('FI') | Hungary | [Flasch] |
| FMC | Hungary | [Flasch] |
| Foley, Joseph E. | Ireland | Riva MD (USA) 2001 |
| Forbin Paris, A(ndré) | Europe, Worldwide (revenues) | Paris, pre-WW2, dealers, [Flasch] |
| Fosaneanu, Paul | Rumania | Bucarest 1897 |
| Four (the number in a circle) | Worldwide | The stamp has been repaired |
| Fourcaut, Jean-Claude | France, Belgium, Monaco | Le Vésinet (France) 2002, dealer. Note |
| Fournier, François | Worldwide (all forgeries) | Marks on front or back of stamps from the Geneva albums of samples |
| Frajola, Richard C. | USA (postal history), BNA, Br. Colonies | New Mexico, Profess. Stamp Experts 2000 |
| François | Jordan (Transjordan) | On forged. Jean Louis F., d. 1941 ? |
| Françon, Robert | France | Latour de Salvagny (France), 1932–99, AIEP 1992–99 |
| Franek, Jaroslav | Czechoslovakia | Prague 1950, 1900–60, expert –1940s |
| Frangats, J. ? | Saudi Arabia (Hejaz) | On forged [APAI] |
| Frank, E. D. | Great Britain | Frankfurt 1897 |
| Franke Berlin | German States | Berlin |
| Franke, Wilfried | Tibet, Chinese PO Tibet | Cologne, b. 1947, BPP 1996 |
| Fränzl, Karl (Franzl, Fraenzl) | Ukraine | Vienna, 1920 |
| Frascati | Greece | . |
| Frégnac, Émile | France | Paris 1943. Note |
| Frenckell, Karl von | Finland | Dresden pre-WW2, Kronberg i.Ts 1950 |
| Frese | Fiume | . |
| Freudenstein, S. | Heligoland, Luxembourg | Frankfurt 1897 |
| Frey, Ch. Th. | German States (Baden), Switzerland | Freiburg/Br., BPP 1961 |
| Frey, Leopold | German States (Bavaria), Germany (excl. Infla) | Deggendorf/Ndg 1961, 1898–1964 |
| Freymuth, Arthur ('AF' in manuscript) | Finland? | Helsinki, d. 1940, dealer |
| Freyse, Gustav ('GF'). Advert. | Albania, Ukraine | Hannover, d. 1921, dealer |
| Friebe, Hans | Italian States (Papal States) | Freiberg 2003, Berlin, BPP 1991 |
| Friedberg, Richard | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Friedel, A. | German States (Brunswick), Ukraine | Vienna, collector, on genuine, [UPNS] |
| Friedemann, Albert | German Col. & PO abroad, Finland, E. Rumelia, etc. | Leipzig, 1867–1933, dealer (Senf?) |
| Friederich, Rudolf | Spain and Colonies | Hagenau i.Els. 1897, [Mi 1935] |
| Friedl (in script), Otto W. Friedl | Worldwide | New York NY (prev. Vienna), 1878–1952, son of S. Friedl, expert 1935–, Friedl Expert Comm. f. 1948, [Brühl p.483, APS]. |
| Friedl, Ing. (= engineer) | Yugoslavia | Maybe Rudolf Friedl |
| Friedl, Rudolf | Austria, Western Ukraine | Vienna 1926, 1862–1942, dealer, brother of S. Friedl |
| Friedl, Sigmund | . | Vienna, 1851–1914, also a forger [Tyler] |
| Friedrich, Paul | Germany East (OPD Ost-Sachsen) | . |
| Frim. För. i Finland, 2 | Finland, Europe | Frimärkssamlarföreningen i Finland's expert committee, Helsinki, 1931–c.1955 |
| Frimmel, Sepp | Germany (field post), Austria | Braunschweig 1950 |
| Frimärkshuset (= Frimaerkshuset) | Sweden | Stockholm 1949, dealers (E. Lundström) |
| Frischer, 2nd vers. | Spain, Hungary | Maybe Norbert Frischer, Vienna 1943 1949, dealer |
| FT | Rumania | . |
| FTF Rio | Brazil | Rio de Janeiro, dealer |
| Fuchs, R. | Hungary | . |
| Fukui, Kazuo | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Fulpius, George(s), Dr. ('G.F.' ?, GF in manuscript) | Italian States, Greece, Finland, Germany, Europe, Worldwide | Geneva 1949, 1886–1955, official expert 1949, AIEP 1954–55 |
| Funck | Germany (field post WW2) | Germany |
| Furuya, Yoshikazu | Japan and areas | Japan, Secretary ECPM (q.v.) 2001 |
| G (in blue): original gum | Belgium and Colonies | See Soeteman, additional marks |
| Gaber, Ante | Yugoslavia (Slovenia 1919) | Ljubljana 1935 |
| Gabisch, Guido | Germany (field post WW2) | Stubenberg, BPP 2001 |
| Gaedicke, Fritz (Infla Berlin) | Germany (Infla incl. Official) | Berlin-Spandau, b. 1923, BPP 1958– |
| Galinos, Alexandre | Greece (postal history) | Athens, b. 1959, dealer, expert 1993–, AIEP 1998–, [PE] |
| Gallitsch, Albert? | Germany (Marienwerder) | Germany; or Ch. Gallitsch, Berlin 1949, dealer; on forged |
| Gálvez Naranjo, Joaquín | . | Chile/Spain, d. c. 1976, AIEP 1970–76 |
| Galvez, Manuel, 2, 3. Advert., hinge | Spain and areas | M. Gálvez Rodriguez, Madrid 1926 1950, 1895–1960, dealer, AIEP 1954–60 |
| GAM | Hungary | [Flasch] |
| Gambert, Ludwig | German States (Thurn &Taxis pre-adh.) | Hammelburg-Obererthal, BPP 1996 |
| Gar. Echt (AW/WA added separately) | Czechoslovakia | German for "guaranteed genuine" |
| Garantie K.F.W. 54 | Hungary | See K.F.W. |
| Garas, N. (ΓΑΡΑΣ) | Greece | Athens 1949 1958, dealer |
| Garcia, Filatelia (cf. Filatelia Madrid) | Spain, France | Madrid, dealers |
| Gazzi, Luigi | Italy | Rovereto TN (Italy) 2001, dealer. Note |
| GB | Germany East (Bezirk 1948) | See Ballschmidt. Günter (?) |
| GC | Italy | See Carraro |
| Gebr. Senf Leip. | Worldwide | See Senf |
| Geigle, Christian E. | Saar (Mi 53–205, Official) | Alzenau, Grünwald 2004, BPP 2003 |
| Gelli & Tani (also 'GT' in square or in circle) | Belgium and Colonies | Brussels 1920 1943, important dealers f. 1860; Gustave Gelli indep. dealer 1926 |
| Gentzsch | German States, Colonies & PO abroad | . |
| Georgstrasse 2, Chemnitz | Worldwide | Chemnitz pre-WW2, dealer's advert. |
| Gerber, Max | Germany (French Zone) | Bad Kreuznach 1961 |
| Gerhardt, Werner | Germany East (Mi 212–1164, Official) | Markkleeberg, BPP 1991 |
| Germania-Ring (the expert committee of) | Germany | Germany (Essen?), 1897–WW2, ass. of German, Austrian and Swiss phil. soc. |
| Gerschler, Herbert | Austria | Chemnitz 1961 |
| Gerzabek, Hubert | Turkey | Vienna 2001, VÖB |
| GF, GF (manuscr. =Fulpius) | Albania, Finland | See Freyse or Fulpius |
| GH AD | Hungary | [Flasch] |
| Ghiglione, Ezio | Italy | Genoa, 1950–68, dealers f. 1885 |
| Gibbons Ltd, Stanley, SG (reported to be Gibbons' mark) | Worldwide | London, dealers, expertising until 1927 |
| Gilbert, Carl | Portugal and Colonies | Porto 1897 |
| Gilbert & Koehler Paris. Note | Europe | Paris, dealers 1904–13 (Heinrich Köhler) |
| Gilbert (+forged, 2) (in script). Photo. | Czechoslovakia, Slovakia, Carpatho- Ukraine, Bohemia & Moravia, Hungary | Dr. Rudolf G., Prague, 1896–1984, expert –1970s, BPP 1961, forged, [Flasch] |
| Gilbert, Fr. Gg. | Turkey | Note |
| Gilbert, S. | Mauritius | Note |
| Gilczynski, Dr. Jan | Greece, Poland incl. PO Port Gdansk, Austria | Cracow, BPP 1961 |
| Gimenez Morata, Antonio Luis | Spain | CEM 1996 |
| Giordani, Prof. Giancarlo. Certif. | Italy | Bologna 1980s |
| Giusti, Corrado. Certif., 2 | Italy | Grosseto IT 2008, b, 1958, expert 2008– |
| Giusto, San. Certif. | Italy, Trieste | See San Giusto, Filatelia |
| Glaettli, Ad., Zürich | Br. East Africa | Ad. Glättli & Cie, Zurich, 1940s, dealers |
| Glasewald, A. E. | Germany (private locals) | Hamburg-Wandsbek 1961, dealers (Ruprecht Glasewald 1904–83) |
| Glasewald, Arthur Ernst ('A.E.') | Germany (private locals) German States (Baden, Thurn & Taxis), Greece, South Bulgaria, Turkey, Worldwide | Gössnitz, 1861–1926, dealer, father of Georg and Ruprecht, [Brühl p.497] |
| Glasewald, Georg | Germany (private locals) | Hamburg 1950, 1895–1972, dealer |
| Glättli, A. | Switzerland | See Glaettli |
| Glatz, István | Hungary | Hungary, b. 1953, expert 1999–, AIEP 2003–, [FFE7, PE] |
| Glavanovitz, Dr. Werner | Austria (1945 Graz) | Vienna 2004, VÖB |
| Glavany, Alfred | Europe, Worldwide (both pre-1900) | Istanbul about 1900, dealer. Note |
| Glucksmann, Michel P. S. | . | France, AIEP 1974 |
| Gluksman, E. | France and Colonies, Europe | Paris 1949, dealer |
| Gmach, Dr. Gertlieb | Rumania (Mi 8–98) | Eching a. A., BPP 2006– |
| Gmähle, Markus (= Gmaehle) | Thailand (pre-1925) | Munich, BPP 1991 |
| Gnädig, Otto (= Gnaedig) | Latvia | Berlin, BPP 1968 |
| Godderis, Dr. Karel | Belgium and Colonies | [Soeteman] |
| Goebel, R(aymond, Dr.) (manuscript) | France (–1900), Luxembourg | Luxembourg, b. 1950, expert 1980–, AIEP 1998–, BPP 2003, [FFE3, PE] |
| Goeggel, Dr. Hugo. Photo | Colombia, Ecuador | Bogotá, b. 1936, expert 1990–, AIEP 2000–, [FFE4, PE] |
| Göldner (not J. Goldner?) | Lithuania | Pre-WW2, collector or dealer |
| Goller, Arnold | Austria (PO Levant), Bosnia & Herz. | Kötschach AU, BPP 2008– |
| Gongvatana, Surajit (Works as member of committee.) | Thailand | Thailand, b. 1951, expert 1991–, AIEP 2003–, [FFE7, PE] |
| Gonic, N. | Yugoslavia (SHS) | Novi Sad (=Neusatz) |
| Gordon, Gustaf; 'Gordon' | Sweden | Sweden, deceased |
| Gosudarstvennaya kontora, 'Гос К' | Russia, Ukraine | On stamps sold by the Soviet Union |
| Gound, Ernst | Yugoslavia (SHS) | Zagreb |
| Goy, Erich | Poland | Berlin 1944 |
| GP (pencil) | Estonia | See Puloaas |
| GPSY. Certif. | Germany incl. all areas | Germany Philatelic Society, USA |
| Grabert, Dr. | Austria (overprints) | On forged |
| Grabowski, Heinz | Germany (air mails, Zeppelin), Germany (1945 Freudenstadt local) | Freudenstadt, BPP 1958– |
| Graeffe, Ragnar | Estonia | Lohja, 1929–2005, Finn. Phil. Fed. 1996–2005 |
| Gráf | Hungary | [Flasch] |
| Graham, David ('DG' in manuscript) | Worldwide | USA (2002), principal auctioneer Greg Manning Auctions |
| Grallert, Wolfram | Germany, Danzig | Leipzig, b. 1924, dealer |
| Granitz, Edmondo | Fiume | Fiume, 1896(or98)–WW2 (killed; stateless Jew, b. Hungary), dealer |
| Granowski, Steven | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Gratton, Richard | Canada, BNA | Windsor PQ, b. 1954, expert 1984–, AIEP 1998–, [FFE3 5, PE] |
| Graus, Francisco/Francesc. Certif., 2, 3 | Spain and Colonies | Barcelona, b. 1939, expert 1974–, AIEP 1983–, [FFE3] |
| Greek Stamp Dealers Association | Greece | Expert committee (Atzaritis, Spanos, Kalfarentzos), Athens 1969 |
| Green, Brian M. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Greene, V. G. | Canada, BNA | 1893–1988, see Vincent ... |
| Gregorcic, (H.) Vilim (William) | Yugoslavia (SHS, Medumurje, Prelog, Mursko & Prekomurje 1919) | Mandroviceva 1935, Zagreb |
| Greif | Portugal | . |
| Greis, Prof. Dr. Ortwin. Certif. Photo | Russia (Zemstvo) | Hamburg, b. 1941, expert 1994–, AIEP 1999–, [FFE3, 5, PE] |
| Grenstedt, Bo | Sweden | (Stockholm, b. 1916 ?) |
| Grey, 2 (same rubber stamp?) | Saint Vincent | The London pre-WW2 dealer E. C. Grey? |
| Griebert, Hugo | Spain, Turkey, South America | London, 1868–1924, dealer, [Tyler] |
| Griffiths, John O. | Great Britain, Australia, Natal, Leeward Is. | Great Britain, 1923–2001, AIEP 1979–84 |
| Grimm | Germany (Infla), Germany East | Germany, 1930s to 40s |
| Grioni, Federico (manuscript) | Italy, Lombardy-Venetia | Milan 1926 1943, dealer. Advert. |
| Grobe, Hans; Grobe (forged) | German States and Colonies, Montenegro, Worldwide (pre-1900) | Hannover 1943, 1899–1994, auctioneer, BPP 1958–, AIEP 1954–82 |
| Grřnlund, Svend (Gronlund, Groenlund). Certif. Photo | Denmark, Iceland, Finland, Brazil | Copenhagen 1969, 1890–1971, also on forged. Note |
| Grothe | Germany (air mails) | . |
| Grubben, Willy (or manuscript) | Belgium | Brussels 1943, dealer, [Soeteman] |
| Gruber, Gunnar | Germany (Upper Silesia, Schleswig) | Radolfzell, BPP 2001 |
| Gryzewski, Tadeusz | Poland | Warsaw 1950, Lodz, 1904–76, AIEP 1961–76 |
| GS, GS + heron | Ukraine | See Seefeldner |
| GT (in square or in circle) | Latin America | See Gelli & Tani; forged (square) |
| Guggisberg, Dr. Alfred | Switzerland, Guatemala | Biel 2001, d. 2004, SBPV |
| Guinand, Pierre | Switzerland (1862–1907) | Morges 2001, b. 1940, expert 1967–, SBPV, [FFE2 3] |
| Guinovart Vidal, Jorge (pencil) | Spain and Colonies | Barcelona, 1920–1999, AIEP 1978–99. Photo |
| Guiraud-Darmais, Jacques | Monaco | Mazamet (France), b. 1928 |
| Gummesson, Per | Finland | Stockholm, 1947–2004 (7 Jan.), dealer |
| Gummesson, Rolf ('RGm' in manuscript). Certif. Photo | Finland (pre-1900) | Stockholm, 1913–2002, dealer 1935–2002, father of Per G. Note |
| Gunter, Erin R. | Confederate States | USA 2000 |
| Gustafson, Bertil | Sweden, French Colonies, etc. | Sweden |
| Gutmann, C. | Japan | Frankfurt 1897 |
| Guttman | Italy | . |
| GvT | Worldwide | See Timroth |
| GW | Hungary | See Winter-Laczay, György? |
| GW | Sweden | See Wennberg? |
| Gwynn, Dr. Robin David (Works as member of committee.) | New Zealand | Napier (NZ), b. 1942, expert 1991–, AIEP 1998–, [FFE3, PE] |
| Györgyik, Sándor, 'GyS' (monogram) | Hungary | A collector's mark |
| H (in blue) | Europe | See Waldemar Herrmann |
| H9 (in circle; in Cyrillic) | Yugoslavia (in WW2) | See Novakovic |
| HA | Uruguay | . |
| Haagsche Postzegel Handel | Europe | The Hague 1943, pre-WW2, dealers |
| Hader, Hermann | Austria (pre-philately) | Guntramsdorf (A) 2001, VÖB |
| Hadi, Mirza ('Mirza-Hadi'). Advert. | Iran (Persia), (he had Transvaal reprinted and forged Serbia) | Paris 1943, later Monaco, dealer, forger, [Tyler] |
| Haefele | German occ. Sudetians | . |
| Haeffner Frias, Julio | Spain and Colonies | Barcelona, 1929–88, AIEP 1978–88 |
| Haertel, M., Geprüft (Max H.). Typical stamp signed by him. | Germany (Upper Silesia), Poland | Germany, d. 1935, often on forged. Note |
| Haferkamp, Dr. Hans | German States (Thurn & Taxis), Germany (1945 Freudenstadt local) | Mainz, b. 1906, BPP 1958– |
| Haffner (frequently by pencil) | Spain | . |
| Hahn, Calvet M. | USA | New York, d. 2004, PSE 2000 |
| Hahn, Henry | Czechoslovakia | Fairfax VI (USA), b. 1927, SCF 2001 |
| Hahne, Gerhard | Central Lithuania | Uetze (Germany), 1927–2006, BPP 1987–99, AIEP 2001–06, [PE] |
| Hall, Herbst | Germany | Dr. Herbst (Hallensia) |
| Hall, T(homas) W(illiam) | Worldwide | London, 1861–1937, Chm. RPSL Exp. Comm. |
| Hall Fl, Halle Flä | Germany East (Bezirk 1948) | See Fläschendräger, W. |
| Hall Rehn | Germany East (Bezirk 1948) | See Rehn, Erhard |
| Hallon, Dr. Pavol | Poland | Malacky (Slovakia), SCF 2001 |
| Hals S.O. Paris, T. and Hals? | Russia (South Russia, Wrangel Army) | See Sredinsky |
| Hamilton-Bowen, Roy | Ireland, Malta, Gibraltar | Rodgau (Germany), BPP 1996 |
| Hamis, Hamisitvány | Hungary | Hungarian for 'Forged', 'Forgery' |
| Hammerschmidt, Rudolf | Netherlands | Düsseldorf, BPP 1958– |
| Hampel, Tadusz | Poland (no. 1) | Lodz 2000, Polish Fed. |
| Hanák | Czechoslovakia | Czechoslovakia |
| Hanciau, Louis Francois | Worldwide | Brussels, 1835–1924, expert employed by Moens |
| Hannes, Walmath | Hungary | [Flasch] |
| Hanssens (in black) | Belgium | Séraphin H., [Soeteman] |
| Hanssens, A. | Belgium | Not reliable; [Soeteman]. All three Hanssens were dealers in Brussels, at least until 1949 |
| Harbrecht, Erich | Sweden (1855) | 2004: Sorrentovägen 5, 269 34 Bĺstad |
| Harder, Dr. Philipp | Germany (1945–6 locals) | Hauenstein 2003, b. 1968, BPP 1996 |
| Harlos, Peter/Friedrich | Germany (Notopfer, Wohnungsbau) | Wunstorf, BPP 1980 |
| Harmer Inc, H. R. | USA (Pres. Roosevelt item) | See Roosevelt |
| Hartmann, Ernst | Samos | Berlin-Steglitz 1950 |
| Hartmann, Hugo | Montenegro | Berlin 1920, b. 1858 |
| HAS | Belgium | . |
| Hase | . | BPP 1958– |
| Hasid, Ariel | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Haspel, Rolf | Germany (field post 1914–19) | Thalheim-Bitterfeld, BPP 1991 |
| Hass, C(harles) F. | Egypt incl. Suez Canal, Sudan | Nashua NH (USA) 2001, dealer |
| Hassel, Ch. | Switzerland, Czechoslovakia | Basel 1949, dealer |
| Hauser, Károly G. | Hungary | Budapest, dealer, [Flasch] |
| Haveman, B. Walter | China (People's Rep.) | Aalen, BPP 2006– |
| Haverbeck, H. D. S. | India | New York, 1913–86, PF |
| Havlas | Czechoslovakia | Czechoslovakia, pre-WW2, dealer |
| Haydzicki, Marian | Poland | Tarnow (PL), 1909–85, AIEP 1960–85 |
| Hechter | Europe | . |
| Heddergott, Jochen | China (Formosa), Chinese PO Tibet, India (excl. States), Nepal, Iran (Persia –1891) | Munich, b. 1936, expert 1969–, BPP 1976, AIEP 1987–, [FFE6, PE] |
| Hederer, Dr. Friedrich | German States (Wurttemberg) | Lorch 1950, BPP 1961 |
| Hedin, Ernst | Sweden, Norway | Stockholm 1897 |
| Hefer, Fred W. (forged) | Czechoslovakia, Bohemia & Moravia | Grünwald, 1924–2003, BPP 1991 |
| Heger, Emil | Austria, Turkey, Europe | Vienna 1920 1935, b. 1877 |
| Heijtz, Stefan | Falkland Is. | Stockholm 2002, dealer. Note |
| Heimann, Karl | Germany East (Official ZKD) | Kassel, b. 1928, BPP 1968 |
| Heimbüchler, Fritz. Photo (second from left) | Rumania | Munich, b. 1930, expert 1970–, BPP 1973–, AIEP 1984–, [FFE3 (p. 170), PE] |
| Heinrich, Thomas. Certif. | German States (Wurttemberg) | Winnenden, b. 1966, BPP 1996– |
| Heintze, Jobst von (forged) | Germany East (Bezirk 1948, OPD Thüringen) | Eisenach 1961, 1906–85 |
| Heintze, Prof. Dr. Jobst von | Germany East (Bezirk 1948) | Magdeburg 2003, Eisenach, b. 1938 |
| Heinzel, Klaus | Germany East (Bezirk 1948) | Stade?, 1950s |
| Heister, Dr. Knut | Venezuela | Bad Münstereifel, BPP 1996 |
| Heitmann, Claus | German States (Bremen) | Munich, BPP 2008– |
| Heitor S. Paulo | Brazil | See Sanchez |
| Hekker (also in upper case letters) | Ukraine | . |
| Helbig, Dr. Joachim (forged) | German States (Bavaria 1876–1920 and Infla, Thurn & Taxis), Sudan, Stellaland | Aschheim 2003, Munich, b. 1949, expert 1979–, BPP 1980, AIEP 1992–, [FFE4, PE] |
| Hellman, Dagmar | [See S. Postim.lehti 3–4/1929 p. 17] | Helsinki 1904, later Stockholm, dealer, [Postryttaren 2004 p. 28] |
| Hellman, E. A. ('EAH') | Finland (and areas) | Helsinki, 1895–1980, dealer-researcher, in use 1930s, expert until c. 1960 |
| Hellman, Kaj | Finland, Russia | Espoo, b. 1948, auctioneer, expert Feb. 2000–. Note |
| Hellrigl, Oswald | India (Jammu & Kashmir), Nepal | Brixen (Italy), 1906–63, BPP 1961, AIEP 1957–63 |
| Hellrigl, Dr. Wolfgang C. | Tibet, Nepal, India (Jammu & Kashmir) | Bozen (Italy), b. 1941, expert 1975–, AIEP 1980–, [FFE1 2 3, PE] |
| Helm, Dr. Bedrich | Czechoslovakia (air mails) | Klatovy (Czech Rep.), expert 2004– |
| Helsingfors Frimärkssamlare Förening, ('H.F.F.'), 2 | Finland | HFF's expert committee, Helsinki, 1897–c.1960 |
| Hennies, Josef. Certif. | Germany (Mi 1–30) | Hildesheim, 1921–85, BPP 1968 |
| Hennig, K(arl), 2 | Austria, Poland, Russia, Ukraine | Weimar 1920, post-WW2 Dominican Rep., dealer, soldier in Ukraine WW1, also on forged (+Hoffmann cards) |
| Herberts | German East Africa | . |
| Herbst, Dr. Horst, 2 (forged) | Germany East (Bezirk 1948) | Frankfurt-Höchst, Kelkheim, d. 1986, expert 1950–86, BPP 1968 |
| Herbst, Lothar | France | Helmstedt, BPP 2003 |
| Herczeg, Kornél | Hungary | Nyiregyháza, [Flasch] |
| Hermann föorvos, Dr. | Hungary | János H., a collector's mark, [Flasch] |
| Hermann, Urs | Switzerland (1850–83) | Liestal (CH), SBPV, BPP 2003– |
| Hermann, Waldemar | Europe, Eastern Rumelia | See Herrmann, Waldemar |
| Hernández, Carlos | Uruguay | Dealer |
| Heron + GS | Ukraine | See Seefeldner |
| Herout, Eduard | Czechoslovakia | Czechoslovakia, 1921–77, SCSF |
| Herpichböhm, Erich | Germany East (OPD Thüringen Mi 92–115) | Munich, BPP 1984 |
| Herrmann, Waldemar (also 'H'). Also written Hermann or Woldemar. | Europe, Eastern Rumelia | Berlin, 1827–1902, dealer, expert 1877–, also on forged, [Brühl p.482] |
| Herst jr., H(erman) | USA | New York NY, 1909–99, dealer |
| Hertsch, Arthur | Switzerland, Eastern Rumelia | Bern (Senf, Zumstein), 1884–1973 |
| Hertsch, Christoph | Switzerland | Bern (Zumstein), b. 1963, expert 1986–, AIEP 1998–, SBPV, [FFE2 4, PE] |
| Hertsch, Max | Switzerland, Europe | Bern (Zumstein), b. 1923, expert 1950–, AIEP 1965–, [FFE3 4, PE] |
| Hettler, Dieter | Germany (Bizone Mi 1–35, certain locals) | Hamburg, BPP 1991 |
| Hevia, Manuel | . | Madrid, 1898–1984, AIEP 1954–c.56 |
| Heweker, Joachim | Albania (pre-1945, incl. locals), Germany East (Bezirk 1948) | Düsseldorf-Holthausen, BPP 1968 |
| Hey, Berend (forged) | German occ.s WW1, Germany (Allenstein) | Bremen, BPP 1991 |
| Heymann, I. | Russia (Armies) | Also on forged |
| HFF, 2 ('Tillhör HFF' is an owner's mark) | Finland | See Helsingfors Frimärkssamlare Förening |
| HGH (in script) | Turkey | . |
| Hildesheim, Werner | Worldwide (air mails), etc. | Dieringhausen 1950, 1906–74, BPP 1958–, AIEP 1954–c.56 |
| Hille, Peter | China (pre-1949), Shanghai | Dresden, BPP c.1991–2005 |
| Hinard, René | . | France, d. 1969, AIEP 1965–69 |
| Hindrichs, Dr. Otto | German Colonies and PO abroad | Germany, dealer, 1881–1957. Note |
| Hines, Edward | USA (postal history, fancy cancellations), BNA, Br. Colonies | Long Beach CA, dealer, PF, Profess. Stamp Experts 2000 |
| Hirsch, Ervin | Czechoslovakia | Czechosl., 1892–1956, expert –1939 |
| Hirsch, Dr. Hermann | Serbia | Munich, BPP 1958– |
| HK (without space) | Germany | See Krause, H. |
| HKBT (in Cyrllic script letters under hammer and sickle) | Russia and areas, Soviet Union | Narodnyi Komissariat Vneshnei Torgovli, applied in 1920s in red or violet, forged |
| Hochkeppeler, Georg | Danzig | Danzig 1935, Berlin-Steglitz, BPP 1961 |
| Hochleutner, Franz | Austria (PO abroad, postal stationery) | Vienna 2001, VÖB |
| Hochstädter, Dr. Dieter,
2 (forged), (Hochstaedter) | Germany (Germania issues, Infla colours) | Munich, Bad Homburg, BPP 1976 |
| Hoexter, Dr. Werner | Israel, Palestine | Haifa, 1907–75, BPP 1961, AIEP 1960–75 |
| Hoffer, Charles | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Hoffman, Josef | Soviet Union | Czechoslovakia, 1919–86, SCSF |
| Hoffman Stamp Co. Hinge | Worldwide | The Hoffman Stamp Co Inc, NY |
| Hoffmann, Klaus | Saar (Official from Mi 52) | Schwalbach-Hülzwiler, BPP 1980 |
| Hoffmann-Giesecke, Günter | Germany (pre-WW1), German States, Germany (field post WW2), German occ. Kurland, German South West Africa, German Colonies incl. GRI | Düsseldorf, 1909–79, BPP 1961 |
| Hofinger, Wilhelm | France | Munich, 1895–1975, BPP 1958–, AIEP 1954–75 |
| Hofmann, Harry von. Photo | Latvia, Russia (Western Army, Wenden) | Hamburg, b. 1931, expert 1982–2001, BPP 1976, AIEP 2000–, [FFE3 4 (p.184) 5 6, PE] |
| Hofrichter, Reinhard | Germany (air mails, Zeppelin) | Kaufbeuren, BPP c.2001–05 |
| Hofsetz, Allen | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Holcombe, Peter (manuscript). Certif1, 2 | Worldwide (pre-1930) | Lucerne 2001, independent expert. Note |
| Hollmann, Dr. Ernst (forged) | German PO Levant | Berlin, BPP 1991 |
| Holm, Ch. | Iceland | [Mi cat.] |
| Holmes, H(enry) Robert | Worldwide | England, 1897–1989, Chairman RPSL Expert Committee, AIEP 1967–74 |
| Holmsten, Martin | Russia (postal history) | Helsinki, prev. Vaasa, b. 1951, auctions, Finn. Phil. Fed. 1997–2004 |
| Holschauer, George | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Holtz, Kurt | Danzig | Danzig 1935, dealer 1943 |
| Hong Kong Stamp Society | Hong Kong | Expertizing Service, Glenside PA, USA |
| Hopferwieser, Walter Michael | Space mail, rocket mail | Salzburg, b. 1954, expert 1993–, AIEP 1998–, BPP 2003, [FFE2 3, PE] |
| Hornung | Spain, USA | Otto Hornung, England? |
| Horrack, Dr. Emil Edler von | Rumania | Vienna 1897 |
| Horvat, R. | Yugoslavia (ovpt SHS, Slovenia) | Croatia, 1940s |
| Hosang, Joachim | Propaganda forgeries WW2 | Since 1950s |
| Hoss | Western Ukraine | On forged, [Bulat] |
| Houtzamer, W. (= W. Howard) | Worldwide | London 1903–, formerly The Hague, dealer 1902–, Br. dealers' ass. STPA expert 1926 |
| Hovest, Ludger | Russia, Soviet Union, Russian PO Levant | Wesel, BPP 2001 |
| Hristov, Stojan | German occ. Macedonia | Skopje, BPP 1980 |
| Hrvatski Filatelisticki Savez | Yugoslavia | Zagreb 1950 |
| HSk | Danish West Indies | See Sk., H. |
| HSdt (monogram) | Worldwide | See Schwindt |
| HSP in triangle | Czechoslovakia | See Suchánek, Hugo |
| HTC (Cyrillic NTS?) | Russia (areas) | Also on forged |
| Hübner, Gerhard (Hubner, Huebner) | Austria, Lombardy-Venetia, German occ. Sudetians | Stuttgart-Bad Cannstatt, d. 1981, BPP 1961 |
| Hudin, Ivo | Hungary, Fiume | [Flasch] |
| Huggins, Dr. Alan K. | Great Britain (postal stationery, incl. Colonies) (line engraved and embossed stamps, specimen overprints) | Watford (GB), b. 1936, expert 1980–, AIEP 2001–, [FFE5, PE] |
| Hujala, Pertti | Estonia | Kirkkonummi, Finn. Phil. Fed. 2005– |
| Hungarofila | Hungary etc. | Budapest, dealers, [Flasch] |
| Hunziker, Hans F. Certif. | Switzerland (pre-1862), Europe | Basel, 1911–94, AIEP 1960–94 |
| Husemann, Franz | Belgium, France | Gladbeck/W. 1950 |
| Hussman Stamp Co, C. E. (or 'C.E.H. CO') | Latin America | St. Louis Missouri, forged |
| HV | Finland, Estonia, Worldwide | See Walli |
| HW | Sweden | See Wennberg |
| Ichida, Dr. Soichi | Japan | Tokyo, 1910–86, AIEP 1979–86, [APS H. F.] |
| Ignatoff–experts–Paris, N. | Armenia, Azerbaijan, Georgia, Russia, Ukraine | Also on forged. |
| Ignetov, Nick | Ukraine | . |
| IHB (or JHB) | India (Azad Hind (1r+2r)) | Dealer? |
| Ikeda, Kenzaburo | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Imbelloni, Marco Emilio | Argentina | Buenos Aires 2004. Note |
| Infla Berlin (+forged twice). See also Echt... | Germany (Infla 1923) | Berlin 2002, expert committee. Note |
| Inoue, Kazuyuki | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Ioannidis, Panos | Greece (Small Hermes), Greek occ. (ovpt.s) | Alimos (Greece), b. 1933, expert 1984–, AIEP 1998–, [FFE3, PE] |
| IP (in fancy letters) | Finland | See Ponsio |
| Irmann-Jacobsen, Hans | Norway, Russia (Armies) | Norway |
| IRO (in circle) | Rumania (Regatul), Hungary | On genuine, [Flasch] |
| Irtenkauf, Klaus | German States (Wurttemberg) | Friedrichshafen 2001, BPP 2003 |
| Isaac, Charles | France and Colonies, Uruguay | Marseille, b. 1922, dealer, expert 1950–, AIEP 1975–, [FFE3, PE] |
| ISFILA | Turkey | Istanbul, expert committee f. 1992. Note |
| Ishikawa, Katsumi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Ising, Wolf | Israel | Ellerbek, BPP 1991 |
| ISJP | Japan | International Society for Japanese Philately Inc, USA, expert committee |
| J (in Courier font) | Czechoslovakia | See Jedlicka, Vincenc |
| J3ar | Yugoslavia | See Bar |
| Jackson, Eric | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Jacob Ernst, Dr. Nestor | Spain and Colonies | Madrid 1970, 1920–94, dealer (Filatelia Hobby), AIEP 1961–87 |
| Jacoby, Willy | Great Britain | London 1897 |
| Jacques, W. A. (pencil) | Andorra | Alec J., Great Britain 2002, dealer |
| Jahn, Wolfgang | Germany East (Official ZKD) | Munich, Vaterstetten 1968, 1928–97, BPP 1961, AIEP 1974 |
| Jain, Pradip | India (air mails), Bhutan (pre-adh.) | Patna, b. 1953, expert 1995–, AIEP 2002–, [FFE6, PE] |
| Jakots–Sibiiu | Hungary | Géza Jakots, Sibiu, [Flasch] |
| Jakubek, Wolfgang | German States (Bergedorf, Hamburg, Schleswig- Holstein), USA, Confederate States | Hamburg, Giekau 2002, BPP 1976 |
| Jakubovich, Isidoro | Argentina | Buenos Aires 2004. Note |
| Jakucewicz, Stefan | Poland (plebiscite areas) | Warsaw 2000, Polish Fed. |
| Jamet, Claude | France and Colonies | France 1998 |
| Jämsä, Risto (Jamsa) | Finland (1963) | Haukipudas, Finn. Phil. Fed. 2004– |
| Jane, R. | Turkey | . |
| Janisch, Marque Garantie | Hungary, Rumania (Regatul) | On genuine stamps, [Flasch] |
| Japan | Marks on forged stamps | [Credit: Kr. Wilhelmsen] |
| Jaretzky, Rolf-Dieter | Mexico | Braunschweig, b. 1935, expert 1994–, AIEP 1997–, [FFE4, PE] |
| Jasch, Dr. Michael | Germany East (OPDs, Großräschen) | Berlin, BPP 1994– |
| Jäschke, Paul Peter (Jaschke) | Germany (Mi 52–97 excl. 67, Official 1–14) | Bremen, dealer, BPP 1980, father of Michael Jäschke-Lantelme |
| Jäschke-Lantelme, Michael (Jaschke-Lantelme, Jaschke-L) (forged) | Germany (Mi 52–97 excl. 67, Official 1–14), Cameroun, East Africa, SW Africa, Togo (all four German); German PO China, Levant and Morocco | Berlin 2003, Bremen, b. 1962, dealer, BPP 1991 |
| Jatia, D(eoki) N. | India | Calcutta, 1930–2000, AIEP 1981–2000 |
| JB | Saar | See Böcking |
| JB | Ukraine (on forged) | See Baumgarten |
| JCz (monogram) | Ukraine | See Cherniavsky |
| Jedlicka, Vincenc ('J' in Courier font) | Czechoslovakia, Austria (incl. Lombardy-Venetia), Hungary | Prague 1897, dealer, d. 1914. |
| Jem, Dr. P., jem (in oval). Echt (as additional mark). Certif. | Armenia, Azerbaijan, Georgia, Russia (Armies, Siberia) | Dr. Paul Jemtschoujin, Dresden, later Mt. Kisco NY (USA), dealer 1920–60s; also on forged. Note |
| Jendroszek, Heinrich Hubert | Poland | Lügde, BPP 2003 until 2006 |
| Jensen, Vagn | Denmark | Denmark |
| Jetrík | Czechoslovakia | Owner's mark. [Hoffmann] |
| JHW | Hungary (Western Hungary) | On genuine, [Flasch] |
| JJT (in circle) | St. Pierre & Miquelon | See Tillard |
| JMrnak | Czecholsovakia | See Mrnak |
| JÖ (in triangle) | Hungary (esp. Debrecen I) | See Örvös |
| Joannovich | Hungary | [Flasch] |
| Jones, Dr. César. Certif. Photo | Uruguay incl. postal history and stationery, Worldwide (aerophilately) | Montevideo, b. 1944, expert Fed. Urugu-aya de Filatelia 1984–, APS 1985–. Note |
| Jonsen, Daniël | Belgium | 1983, b. 1947, [Soeteman] |
| Joris, Cornelio | Costa Rica, Cuba, Cyprus | Munich 1897 |
| JSCHL ('J.SCHL') | Worldwide | See Schlesinger, J. |
| Juchert, Bernd | Brazil | Kloster Lehnin (DE), BPP 1991 |
| Julij Bar | Yugoslavia | See Bar, Julij |
| Jungjohann, Heinz Erwin
(forged), 2, 3 (used on forgeries) | Poland (locals, Polish Corps, PO Port Gdansk), German occ. Poland (GG) | St. Peter-Ording, b. 1929, expert 1970–, BPP 1970–2004, AIEP 2000–, [FFE4 (p.178) 6, PE] |
| Juretzky, P. ('FF' monogram) | Rumania (Regatul), Hungary (Debrecen) | A forger, [Flasch 172] |
| Jutzewitz, Ing. (engineer) | Ukraine | . |
| JV (in circle) | Yugoslavia | See Velickovic |
| JW | Estonia | See Weiner, Julius |
| K | Ukraine | See Kedrovsky |
| K&Z (in oval circle, in red or black) | Netherlands and Colonies, Worldwide | See Keiser |
| Kacskovicz, Dr. | Rumania (Regatul) | [Flasch] |
| Käfer (picture of beetle) | Germany (and several related areas) | See Dub, Dr. Emil |
| Kähäri, Heikki (Kahari) | Finland (stamp booklets) | Luxembourg, Finn. Phil. Fed. 2004– |
| Kaiser | Germany East (Bezirk 1948) | . |
| Kaiser, Pierre (Jean Marie) | Belgium and Colonies | Brussels, b. 1956, dealer, expert 1996–, AIEP 2001–, [FFE5, PE], [Soeteman] |
| Kaiser, Slavomir | Denmark, Faroes, Norway, Czechoslovakia, Switzerland | Denmark 1982, 1960s |
| Káldor, Dr. | Fiume | . |
| Kalinowski, Mariusz | Poland (locals, PO Port Gdansk) | Warsaw 2000, Polish Fed. |
| Kálmán | Hungary (Debrecen) | Dealer, on forged, [Flasch] |
| Kaplan, C. | Czechoslovakia | Czechoslovakia, dealer |
| Kaplanek, Karel ('KAP', 2, in oval) | Czechoslovakia | Prague 1949, dealer |
| Kapras | Czechoslovakia | Dealer |
| Kapusi, Géza ('KG' in oval). Note | Hungary (Debrecen), Rumania (Regatul) | Debrecen, [Flasch] |
| Karaivanoff, Petko V(assilev), PVK, 2. Certif. | Bulgaria, German occ. Macedonia | Sofia 1949, b. 1874 (living 1957), dealer |
| Karaivanoff, Vassil P(etkov). Certif. | Bulgaria, Eastern Rumelia | Sofia (ul. Han Krum no. 7) 2000, b. c. 1922, son of P. V. Karaivanoff |
| Karasek, H. | . | VÖB a.o. member |
| Karásek, Ján (Jan Karasek) | Czechoslovakia, Bohemia & Moravia. Also on forged | Brno, b. 1927, expert 1960–, AIEP 1964–, SCF –2003, [FFE2 3, PE] |
| Karatzas, Takis | Crete, Greece (ovpt.s on Crete) | Athens, b. 1943, expert 1989–, AIEP 1998–, [FFE3, PE] |
| Kardosch, Velizar M. | Serbia | Romanshorn (CH) 2004, SBPV, [FFE7] |
| Karmi, Väinö | Estonia | Tallinn, d. c. 2001, expert c. 1991–99 |
| Karvonen, V. J. (pencil). Photo | Finland (esp. Aunus) | Viljo (Jaakko) K., Helsinki, 1901–89?, indep. expert. Note |
| Kapar, Jirí (Kaspar) | . | Pardubice (CZ), SCF 2001 |
| Kastaun, Jürgen | German States (Prussia, and other) | Münster, BPP 1980 |
| Kasterin (in Russian script) | . | . |
| Kauert, Richard | German States (Oldenburg) | Borgstede/Varel 1950, 1907–c.87, BPP 1961, AIEP 1957–87 |
| Kaufmann | Albania | = Hugo K.? |
| Kaufmann, Hugo | Austria | Slovakia, pre-WW2 |
| Kaufmann, Patricia A., 'PAK' lightly in pencil | Confederate States | Lincoln, DE, USA, dealer 1973–. Note |
| Kauppi, Hannu | Finland (1930 issue) | Haukipudas, b. 1946, Finn. Ph. Fed. 2002– |
| Kay, Alexander Berridge | Br. Colonies | London, d. 1944, dealer, BPA expert comm. |
| Kayssner, Kurt | Czechoslovakia (Posta 1919), etc. | Germany, d. c. 1937, renowned expert |
| Kazár | Rumania (Regatul) | A collector's mark?, [Flasch] |
| Kedrovsky, Volodymyr, 'VK', 'K' | Ukraine | 1890–1970, political and military leader |
| Keiler, Dr. Eberhard, 2 (forged) | German occ. WW2 Baltics, Russia and Ukraine; Germany (Marienwerder), Russia, Soviet Union | Munich 1950, Trier, BPP 1961 |
| Keiser, Gustav; also (earlier) 'K&Z' in oval circle (in red or black) | Netherlands and Colonies, Worldwide (classics) | The Hague, d. c. 1980, dealer, considered to be a highly reliable mark |
| Keitsch, W. Envelope | Czechoslovakia (Posta 1919) | Karlovy Vary, pre-WW2, dealers |
| Kellens, Georges (manuscript) | Belgium | Belgium |
| Kemény, Andor (Kemeny) | Rumania (Regatul), Hungary, Fiume | Oradea, dealer, [Flasch] |
| Kempe, Dr. L. | Germany East (OPD Ost-Sachsen) | [Mi cat.] |
| Kendall, Thomas | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| KERN | Russia (areas) | Also on forged. |
| Kesselstatt, Franz E. Graf (forged) | Germany (field post Tunis) | Trier, Föhren, BPP 1976 |
| Kessissoglou, Thales | Greece | Athens 1949, dealer |
| Kessler, F. W. | Newfoundland, Iceland etc. (air mails) | Dealer at least 1950–60s |
| KFW 54, Garantie | Hungary | [Flasch] |
| KG (in oval) | Hungary | See Kapusi |
| Khorchid, Samad | Iran (Persia) | Teheran, 1920–87, AIEP 1976–83 |
| Kicukis, Athanas ('AK' in script) | Turkey | Istanbul before 1956, dealer |
| Kiddle, Francis E(dgar) | Great Britain PO Morocco, Gibraltar, Kuwait | North Fleet (GB), b. 1942, expert 1980–, AIEP 1999–, [FFE3, PE] |
| Kief (in German type) | Armenia, Azerbaijan, Georgia, Russia | Also on forged |
| Kiehnle, Ferd. | German states | Pforzheim 1897S |
| Kieltsch, Alfred | Rumania (Regatul) | Sibiu (Hermannstadt) |
| Kilian, Jürgen | German Colonies (British and French occ.), German PO Morocco | Hamburg, BPP 1980 |
| Kimmel, Kurt E. (forged) | Switzerland (pre-1907, hotel posts), Austria, Liechtenstein, Venezuela (1859–80), Ceylon (pre-1910) | Massagno (CH) 2001, Richterswil (CH), b. 1941, expert 1972–, BPP 1976, AIEP 1991–, SBPV, [FFE3 5, PE] |
| King, Willie A. ('wak') | Saudi Arabia | Scotland. Note. Arabian Phil. Assoc. Int. |
| Kingsley, Tom | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Kinnunen, Sulo | Finland (Aunus) | Lappeenranta, 1894–1966, SF expert |
| Kinns, Dr. Philip | Indian States | England 2003, Stanley Gibbons Ltd, BPA expert committee |
| Király, Tibor ('K.T.') | Hungary | [Flasch] |
| Kirchhofer, Hans | Switzerland | Geneva 1897 |
| Kirker, Joe | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Kiss, Dr. | Rumania (Regatul) | [Flasch] |
| Kiss, Lajos ('KL' in circle) | Rumania (Nagyvárad local 1945) | Oradea (Nagyvárad), [Flasch] |
| KJ, Dr | Hungary | [Flasch] |
| KL (in circle) | Rumania (Nagyvárad local 1945) | See Kiss, Lajos |
| Klambauer | Austria | Austria |
| Klein, Dr. Udo E. | Lithuania, Memel | Wilnsdorf, BPP 1996 |
| Klein, Eugene. Note | Worldwide (excl. USA) | Philadelphia PA 1926, 1878–1944, dealer |
| Klein, Jean-Pierre | . | Luxembourg, 1886–1974, AIEP 1968–74 |
| Kleysl?, Károly | Fiume | [Flasch] |
| Klichow | Russia (Wenden) | Berlin pre-WW2 dealer Albert Klickow? |
| Klink, Johannes | Germany (AM-Post, Bizone) | Niebüll/Schleswig, BPP 1961 |
| Klinkhammer, Hubert | Germany (Official Mi 52–64), German States (Württemberg Mi 44–62, Official) | Hirschlanden, Ditzingen, d. 1997, BPP 1968 |
| Kloss, Paul | USA, etc. | Dresden, 1848–1918, expert c. 1880– |
| Knapp, Rev. Stephen | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Kneitschel ('VK' or in manuscript) | South America | Victor K., Buenos Aires, dealer c. 1930–1980 |
| Kniep, Karl | Danzig (incl. Port Gdansk) | Wiesbaden, BPP 1980 |
| Knopke, Dr. Karl | Great Britain (pre-1952 excl. Official) | Hohen Neuendorf, BPP 1991 |
| Křbenhavns Philatelist Klubb | Denmark | Copenhagen 1950 |
| Kobold, Gustav | Germany (Infla) | Germany, 1885–1945 (b. 1865?) |
| Kobylanski, Eugen | Ukraine | Vienna, BPP 1980 |
| Koch, August | German States (Bremen) | Bremen, BPP 1968 |
| Koefoed, O. | Denmark | [Mi cat.] |
| Koenigsfest, W. (= Königsfest) | Finland | Germany?, dealer?, early 1900s |
| Koetz, Joseph | . | Luxembourg, 1897–1976, AIEP 1968–76 |
| Kogebinas, A. | Greece | Corfu 1941, Pres. Corfu Philat. Soc. |
| Koh, Seow Chuan | Malaya, Thailand, Philippines | Singapore, b. 1939, expert 1970–, AIEP 2002–, FIP President, [FFE6, PE] |
| Kohl, Paul | Europe | Chemnitz, 1852–1925, dealer |
| Köhler, H., 2, 3, 4. (= Koehler, Kohler) | German States (Brunswick, Thurn & Taxis), German Colonies, Rumania (old), Ukraine, Europe, Worldwide | Heinrich K., 1881–1945; dealers f. Berlin 1913, started expertising before 1934, Wiesbaden 1949, (cf. Gilbert & K.), in use c. 1960–95 (?), [Brühl] |
| Kokk, Kalev | Estonia | Tallinn 2004, EFL 2004–. Note |
| Kolbe, Hans | . | Austria, 1906–82, AIEP 1956 |
| Koliski, Artur ('A.K.' in circle) | Ukraine | Berlin, collector |
| Kollektioner, Tallinn | Estonia, Europe (on forged) | Eesti Kollektioner, stamp magazine |
| Königsfest, W. (Konigsfest) | Finland | See Koenigsfest, W. |
| Konnerth | Hungary (Western Hungary) | Not reliable, [Flasch] |
| Koopman, Herman | Netherlands and Colonies, Poland (P-P on Austria), Fiume, Rumania (Regatul), Ukraine | Amsterdam, later Kalmthout (Belgium), dealer, d. c. 1987, BPP, AIEP 1968–87, reliable, [Flasch] |
| Körner, Karl, Wien I (Korner, Koerner). Advert. | Western Ukraine | Vienna, dealer, forged, [Bulat] |
| Korszen, Zbigniew | Poland | Lublin 2000, Polish Fed. |
| Korte, Wolfgang | German States (Hannover, Mecklenburg-Schwerin) | Würzburg 1950 |
| Kosack, Philipp Kosack | Europe, Worldwide | Philipp K., Berlin 1897 1926, 1869–1938, dealer, [Flasch] |
| Kosel, Adolf | Worldwide (air mails) | Austria, 1911–74, AIEP 1960–74 |
| Kosina, J. (Jiri) | Czechoslovakia | Prague, up to WW2, dealer |
| Kottelat, Ernest R. | Switzerland | Bern 1943 1961, 1896–74, dealer, AIEP 1954–74 |
| Kovács | Hungary | Also on forged, [Flasch] |
| Kovar, Adolf | Czechoslovakia (Posta 1919), Austria (1945) | Vienna 2001, auctions (Dorotheum), VÖB |
| Kovarik, Jaroslav | Czechoslovakia | Prague, expert 1957– |
| Kowollik, Dr. Gotthard | Germany (Infla incl. Official) | Berlin, BPP 1991 |
| Kozak, Karol | Czechoslovakia | Slovakia, 1940s, cf. Slovensky F. |
| KP (Cyrillic for KR) | Ukraine | See Rodendorf |
| Kracík | Czechoslovakia | . |
| Kraft, Jürgen (Juergen, Jurgen) | Germany and States, Worldwide | Canary Is. 2005, former dealer. Note |
| Krakow, Philatelia | Poland (Cracow 1919) | See Philatelia Krakow |
| Kralicsek, Béla | Hungary | Temesvar 1897 |
| Kramer | Czechoslovakia | . |
| Kramp, Hans-Ludwig | Germany (1945 Altentreptow, Demmin, Grabow, OPD Mecklenburg-Vorp.) | Wendorf bei Rieps 2004, prev. Schmilau, BPP 1991 |
| Kranik (Kronik?) | Fiume | Leonard Kranik |
| Krapp, W. | Austria (newspaper stamps), Rumania | Vienna 1897 |
| Kraus, A., Leipzig | Turkey | Leipzig, dealer |
| Kraus, Ján | Czechoslovakia | Prague, Neratovice, 1941–2001, dealer |
| Krause, H(orst), (also 'HK') | Germany and States (esp. Bavaria) | Germany pre-WW2, well-reputed dealer |
| Krause, Richard | Italian States (Papal States) | Germany, b. 1857, expert of 1887 |
| Krawczyk, Eugeniusz | Poland | Warsaw 2000, Polish Fed. |
| Krebs, Arnold | Hungary (Baranya), Yugoslavia (SHS) | . |
| Krefl, F. | Yugoslavia | . |
| Kreft, Wilhelm | Germany (field post Hela, occ. Kurland) | Wedemark, BPP 1984 |
| Kreke, Jan van der | Czechoslovakia (Legion in Siberia) | Koog aan de Zaan (NL), SCF 2001 |
| Kretzschmar, Dr. Gunter | Portugal (Mi 1–700) | Dresden, BPP 1991 |
| Krgr | German States, Russia (areas) | See Krüger |
| Krickmeyer, Edgar | Latvia | Merzen ü. Bramsche 1950 |
| Krischke, Gerhard (forged) | German occ.s WW2 (most areas) | Hannover, BPP 1980 (now independent) |
| Krist, Walter | Hungary (Western Hungary) | Budapest, dealer, [Flasch] |
| Kroat. Philatelistenverband | Yugoslavia | See Croatian... |
| Kroiss, Peter | Austria (postal history) | Biedermannsdorf (A) 2001, VÖB |
| Kroll, Herbert | Germany (field post Inselpost) | Hamburg 1950 |
| Kronenberg, Dr. Stanley | Poland (Cracow 1919), Ukraine | USA 1987 1997, collector, UPNS |
| Krook, Carl | Finland (postal stationery) | Turku, 1916–88, dealer (Stampco), Finn. Phil. Fed. expert 1981–88 |
| Krötsch, Hugo (Krotsch, Kroetsch) | German States (Bergedorf, Lubeck, NDP) | Leipzig, 1858–1937, dealer |
| Krug, Hansmichael | Germany (Mi 1–30), Dominican Rep. | Frankfurt/M, b. 1948, expert 1994–, BPP 1996, AIEP 2002–, [FFE6, PE] |
| Krüger, Karl (Kruger, Krueger) | Japan | Lübeck-Kücknitz, BPP (1968)–82. Note |
| Krüger, J., Berlin | Ukraine | Berlin, dealer, [UPNS] |
| Krüger, Krgr (Kruger, Krueger) [also on forged] | German States, Rumania, Ukraine, Turkey; 'Krgr': Russia (areas) | Paul K., Berlin-Grünewald, pre–WW2, same as J. Krüger? |
| Krumhaar, Otto | German States and Colonies, German occ. Libau, Europe and Worldwide (pre-1900) | Hamburg 1950, 1888–1967, Edgar Mohrmann auctions, BPP 1961, AIEP 1958–67 |
| Kruschel | German States | . |
| Kruson, Jaroslav | Austria | Czechoslovakia, 1906–86 |
| Krutina, Vratislav | Soviet Union (air mails) | Czechoslovakia, b. 1913, SCSF |
| Krynine, P. | Russia (Armies) | Also on forged |
| KS & Co | Hungary | On forged, [Flasch] |
| KT (in oval) | Hungary | See Király |
| Kubis | Czechoslovakia | . |
| Kuchukis ('AK') | Turkey | See Kicukis |
| Kulda, Dr. Jiri | Czechoslovakia | Czechoslovakia, 1925–98 |
| Kullberg, Birger J. | Finland | Helsinki, 1911–90, Finn. Ph. Fed. 1981–90 |
| Kunetz, László | Hungary | Szabadka, later Vienna, dealer |
| Kunz | Finland | . |
| Kunz, Jens | Germany (1945–6 certain locals) | Üxheim (Germany), BPP 2003 |
| Kunz, Julius | Austria (pre-1918), Bosnia & Herzegovina | Vienna 1950, auctioneer, b. 1887. Note |
| Kuras, Helmut | Estonia | Wiesbaden 2005, EFL 2005–. Note |
| Kurchan, Dr. Mario D(avid). Photo | Argentina | Olivos (Arg.), 1924–2003, expert 1948–, AIEP 1978–2003, [FFE2 4 (p.179) 5 6] |
| Kurkiewicz, Witold | Poland | Warsaw 2000, Polish Fed. |
| Kurtz, F. | Russia (areas) | Also on forged |
| Kurze, Günther | Germany (Infla) | Halle, BPP 1991 |
| Kuuskvere, Aivar. Certif. | Estonia (excl. German occ.) | Elva, b. 1960, expert 2002–. Note |
| Kuwano, Hiroshi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Kuyas, Tevfik (manuscript) | Turkey | Sisli-Istanbul, 1916–89, AIEP 1977–89 |
| KV | Russia | See Vassilyev |
| Kvasnicka, Zdenek | Czechoslovakia | Czechoslovakia, 1905–93, SCF |
| LA (or AL) (monogram) | Ukraine | See AL |
| Labres, Klaus | Austria (1850) | Vienna 2001, VÖB |
| ladybird, ladybug (beetle, picture of) | Germany (and several related areas) | See Dub, Dr. Emil |
| Laitinen, Aaro | Finland (fancy cancellations) | Pori, Finn. Phil Fed. 1981–90 |
| Laiz Castro, Dr. Angel | Spain | Madrid 1973, CEM 1996 |
| Lambotte Fils, Jules | Belgium and Colonies | Verviers 1920, dealers |
| Lamonaca | Italian occ. Greece | ? |
| Lamy, G(eorges) | Mexico | France, 1894–1972 |
| Landini, Adriano | Lombardy-Venetia, Italian PO China, Hong Kong | Milan, b. 1927, AIEP 1996–2000 |
| Landmann, K., Berlin; 'Landm' | Ukraine | Odesa, Berlin, dealer; not same person? |
| Landré, Dr. George (Landre) | Germany (Allenstein, Marienwerder, Upper Silesia [also on forged]), German occ. (Ober Ost, 10th Army), Poland incl. towns, Polish PO Port Gdansk, German occ.s Poland, Central Lithuania, Rumania occ. Kolomyya, Western Ukraine | Goslar 1950, Bremen, b. 1899, BPP 1961, AIEP 1954–c.66 |
| Lange, Carl H. | German States (in the north, incl. Heligoland), Denmark | Hamburg 1950 1961, respected dealer |
| Lange, Gertraud | German States (Brunswick) | Hamburg, BPP 1991 |
| Langhammer, Miroslav | Czechoslovakia | Czech Rep., b. 1952, expert 2004– |
| Langs, William S. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Lantelme, Dr. Horst W. (forged) | German Colonies (in Oceania, excl. GRI) | Baldham, BPP 1984 |
| LaPe | Finland | See Peltonen |
| Larisch, Anselm. Ad. | Turkey, Spain, etc. | Munich, 1843–92, dealer, successor wife Bertha, [Brühl p.492] |
| Laroze | France | Georges L., Givors, dealer ? |
| Laszkiewicz, Prof. Antoni | Poland, Central Lithuania | Warsaw 1950, 1904–80, AIEP 1970–80 |
| Lavrov, Petr | Russia, Soviet Union, Austria | Czechoslovakia, 1895–1975, CSF expert |
| LAY | Rumania (Regatul) | On genuine, [Flasch] |
| LBS | Hungary (Debrecen, Baranya) | On genuine, [Flasch] |
| LD | Hungary | See Lugosi |
| Lea, William Edward | . | Great Britain, 1908–70, AIEP 1958–70 |
| Leaf of lime-tree (a picture) | Czechoslovakia | Czech experts' mark |
| Leder, Dieter | Worldwide (Zeppelin, catapult mail) | Meersburg (Germany), b. 1970, BPP 1998–2005, AIEP 2002–, [FFE4 6, PE] |
| Lee, James E. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Lee, Ronald A(lbert) G(eorge) | Great Britain and Colonies, Greece, Chile | London, 1912–90, RPSL, AIEP 1976–90 |
| Lehnert | Hungary (Western Hungary) | Budapest, on genuine, [see Flasch 110] |
| Lehtonen, Kari | Finland (1917–29) | Lahti, Finn. Phil. Fed. 2004– |
| Leinonen, (Kaarlo) Jorma | Finland | Helsinki, 1929–91, Finn. Phil. Fed. 1981–91 |
| Leitenberger, Friedrich | Czechoslovakia (Hradcin issue) | Teplice-Sanow (Cz.), 1890–1933 |
| Lellep, Olev | Estonia | Stockholm, expert c. 1940–50 |
| Lemaire, Th.(eophile) | French Colonies, Heligoland, etc. | Paris 1926, dealer (t.a. Maison Arthur Maury, q.v.), exhibitor |
| Lemberger, Hellmuth (forged), 2 (in script) | Heligoland | Hamburg, BPP 1976 |
| Lenart | Hungary (Szeged) | Also on forged, [Flasch] |
| Lengyel | Hungary (Baranya) | Also on forged, [Flasch] |
| Lenze, Carlos | Spain | Madrid 1950, 1882–69, dealer, AIEP 1954–c.56 |
| Leonhard | Germany (Germania issues), German States | . |
| Leopol., FSA. | Ukraine | . |
| LePileur, Jacques | France | See Pileur |
| Lerche, Robert | German East Africa (Witu) | Germany, b. 1878 |
| Leetický, Jaroslav ('Lý', forged). Photo | Czechoslovakia (Posta 1919), Hungary | Czechoslovakia, 1866–1936, initiator of the Posta 1919 ovpts, expert c. 1920–, not reliable. [Flasch] |
| Leetický Ustredna (also boxed) (Leseticky) | Czechoslovakia | Leetický expert committee, Cz. |
| Lesher, Ron | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| lest | Hungary | Also on forged, [Flasch] |
| LI | Hungary | [Flasch] |
| Liberman, W. (R.) ('WRL') | Crete | 1970s |
| Lichtenstein, Alfred F. | Worldwide (pre-1940) | New York 1926, 1876–1947, chairm. PF |
| Liedel, Karl-Heinz | Andorra | Rodgau, BPP 1984 |
| Lieder, Günter (forged postmark) | Germany East (Bezirk 1948) | Hamburg, BPP 1991 |
| Lievsay, John E. (Works as member of committee.) | France (pre-1900), French Colonies (general issues) | Old Greenwich (CT, USA), b. 1932, expert 1979–, AIEP 1999–, [FFE2, PE] |
| Lima Torres, Manuel Angelo Domenech | Portugal and areas | Portugal 2005, Inexfip member |
| Lindberg, George B. Photo | Estonia, Latvia, Lithuania, Central Lithuania | Slite (Sweden), later Stockholm, 1907–96, BPP 1961 |
| Linden, James van der. Photo | Belgium and Colonies | Aachen 2003, b. 1930, expert 1975–, AIEP 1997–, BPP, [FFE4, PE] |
| Lindenberg, Paul P. | Palestine, Egypt, Sudan | Berlin 1935, b. 1894 |
| Linder, Leo | Finland | Helsinki 1970, b. 1910 |
| Liniger, Werner | Switzerland (cancellations) | Bern, b. 1918, BPP 1976, AIEP 1964–94 |
| Lintner, K. | . | VÖB honorary member |
| Lion (state arms) | Czechoslovakia | . |
| Liphschutz, Michel. Photo | Russia, Soviet Union, Finland | Neuilly-sur-Seine, 1910–94, AIEP 1982–94 |
| Lippschütz, Alfred (forged) | Germany (Berlin) | Berlin, BPP 1968 |
| Liska, Antonin L. | Ukraine | Prague, dealer, [UPNS], expert 1957– |
| Lissiuk, New York | Armenia, Azerbaijan, Georgia, Russia (Armies, areas), Worldwide (air mails) | Kalenik L., New York NY, 1889–1980, dealer 1924–44, also on forged. Note |
| Liston, Dr. Edward M. | Scientific paper research | Belvedere CA USA, b. 1930, expert 1994–, AIEP 2002–, [FFE6 6, PE] |
| Litle, William A. | USA, BNA, Br. Colonies | Dealer, Profess. Stamp Experts 1990– |
| Liubinskas, Juozas | Lithuania | Chicago 1950 |
| Livingston, Lyons F. | China | USA, d. 1971 |
| Ljungström, Dr. Ernst | Sweden | Lund 1897 |
| LL (in circle) | Yugoslavia (SHS) | On genuine, [Flasch] |
| Llach, Eugenio | . | Barcelona, 1889–1973, AIEP 1954–73 |
| Llach Serrabella, Josep (José) (Works as member of committee.) | Spain and Colonies | Barcelona, 1929–2006, expert 1964–2006, COMEX 1996, AIEP 1978–2006, [FFE3 6, PE] |
| LLx (in circle) | Hungary | [Flasch] |
| LM (fancy letters) | Hungary | On genuine, [Flasch] |
| Lo (in circle) | Hungary (Debrecen) | On genuine, [Flasch] |
| Löbbering, Thomas | Estonia | Holzappel, BPP 2004– |
| Locher, Paul | Turkey | Nice 1926, dealer, same as in Switzerland (Spiez) later (e.g. 1943)? |
| Loeuillet, Roger-Louis | France and Colonies | Nice, b. 1926, expert 1979–, AIEP 1987–, [FFE3, PE] |
| Löhden, Klaus (Lohden, Loehden) | German States (Hamburg) | Schwarmstadt, BPP 1980 |
| Londońo-Tamayo, Jairo | Colombia | Bogotá, 1916–2000, AIEP 1981–2000 |
| Longhi, Fiorenzo. Note | Italy (air mails), Ecuador (air mails) | Belgirate VB (Italy) 2001, b. 1951, dealer, expert 1995–, AIEP 2003–, [FFE7, PE] |
| Loo, Pieter F. A. van de. VDLOOBDK (scan credit A. P. Lenos) | Netherlands and Colonies | B. 1941, BDK Bondskeuringsdienst (Dutch Federation's Expertising Service) 1987–, [FFE2] |
| Loo, H. v. d. (Hendrik van der Loo) | Netherlands, Worldwide | The Hague (Rotterdam pre-WW2), dealer –1960s?, [HvdVlist/WvLoo] |
| Loo, Wilhelm van. Photo (at left), 2 | German occ. Kurland | Aachen, b. 1934, BPP 1978–, [FFE2 5 6] |
| Lorenc, Jaroslav | Czechoslovakia | Czechoslovakia, SCSF expert 1957– |
| Lossau, J. | German States (Hamburg), France and Colonies | Hamburg 1897 |
| Louis, Dr. Albert | Netherlands | Hürth, b. 1925, expert 1976–, BPP 1976–, AIEP 1983–, [FFE1 3, PE] |
| Louis, Karl-Albert | Great Britain (Mi 1–101, not Official) | Taunusstein-Hahn, b. 1961, expert 1990–, BPP 1991–, AIEP 1995–, [FFE1 3 6, PE] |
| Lowe, Robson. Certif., 2 | Australia, Br. Colonies, USA (locals), etc. | London 1926, 1905–97, dealer, chairman BPA Expert Committee, AIEP 1970–97. BPT WhoWasWho |
| Löwenhagen, R. | Mexico (not locals) | Germany 1897 |
| Lu, David | China (air mails) | Rowland Heights CA USA, b. 1968, expert 1997–, AIEP 2002–, [FFE6 6, PE] |
| Lück, E. | Ukraine | . |
| Lüders, Prof. | German States (Schleswig-Holstein) | . |
| Ludin, Emil | German occ. Kotor, Zara and Zante | Bretten/Baden, b. 1920, expert 1951–2000, BPP 1961, AIEP 1956–2004, [FFE4 5] |
| Luff, John N. | USA, Central America, South America | New York 1926, 1860–1938, APS expert |
| Lugosi, Döme ('L D') | Hungary (Szeged etc.), Rumania (Regatul) | [Flasch] |
| Lundegaard Nielsen, Gunner | Denmark | See Nielsen, Gunner Lundegaard |
| Lundmark, Elis | Finland (Aunus) | Helsinki, b. 1895, SF expert |
| Lundström, Einar. Photo | Sweden, Norway, Denmark | Stockholm, 1910–94, dealer (Frimärkshuset), AIEP 1970–94 |
| Lutz Committee Ltd, The. Certif. | Worldwide | New York NY 10021, 1984, Abbot Lutz, d. c. 1986, dealer, also on forged |
| Lutz, Dr. Hans | Germany (Bizone Bauten Mi 73–100) | Giessen, BPP 1980 |
| Lý | Czechoslovakia (Posta 1919) | See Leetický |
| Lyman, Robert W. | Canada (BNA), New Zealand | Irvington NY, b. 1925, expert 1980–99, AIEP 1987–, [FFE4, PE] |
| Lyons, Larry | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| m (large size, 4x3 mm) | Crete (Therison) | Seen on genuine, original Therison stamps |
| M + Sz ('M/cross/Sz') | Hungary | Hungarian Philatelic Federation, 1926– |
| Mćrket er ćgte men, ureglementeret afstemplet | Greenland (parcel stamps) | Danish for: "The stamp is genuine but cancelled contrary to regulations". |
| Macdonnell, David | Ireland | Dublin, b. 1954, expert 1981–, AIEP 2001–, [FFE5 6, PE] |
| Macoveanu, P., 2 | Europe | Paris 1956, 1990s. Note |
| Madame Joseph Forged Cancel (boxed, in green). Note | Br. Colonies | Applied by Stanley Gibbons Ltd to stamps with forged postmark, c. 2000– |
| Madarasz, Jules (= Gyula) | Hungary | Budapest, 1900–81, AIEP 1970–81 |
| Mahé, Pierre-Marie | France | Paris, 1833–1913 |
| Mahr, Max (forged) | Czechoslovakia, Slovakia, Bohemia & Moravia, Sudetians | Düsseldorf, b. 1917, BPP 1976, AIEP 1979–92 |
| Maier, Jörg | Chile (incl. occ. of Peru) | Bubenreuth, Munich, b. 1940, expert 1980–, BPP 1980–, AIEP 1991–, [FFE3, PE] |
| Maier Berlin, M. Kurt (very small size) | Germany and States, Hungary etc. | Michael Kurt M., Berlin, 1885–1949, dealer, expert –1931 |
| Maigatter, Lutz | Germany East (Bezirk 1948) | Viersen, BPP 1991 |
| Maisel, Bill | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Majer | Czechoslovakia | . |
| Majörg, Karl | Austria (post-1945 postal history) | Wartberg a.d.K. (Austria) 2001, VÖB |
| Majoros, Laszlo | Hungary (Sopron 1956) | Budapest 2001 |
| Majs, Sándor | Hungary | Budapest, dealer, [Flasch] |
| Mák | Rumania (Regatul) | [Flasch] |
| Malecek, Jaroslav (in script) | Czechoslovakia (Hradcin issue) | Prague, b. 1940, SCF 2001 |
| Mandel, Frank | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Mandrovski, Nicolai | Russia, Soviet Union | Russia, b. 1945, AIEP 1997–99, frequently on forged |
| Mangold, Otto | Portugal and Colonies | Frankfurt a.M. 1897 |
| Mansfeld, Kurt | German Colonies | Bad Kreuznach, BPP 1958– |
| Mantow (Mantau), Sophie ('S.M.') | Europe | Berlin 1905, dealer. Advert. |
| Mantke | Switzerland | . |
| Mar..., Erkki | Worldwide | Mikkeli (Finland), collector |
| Marbach, 2, or 'L. Marbach Wien II' | Hungary, Russia | Leopold (?) M., Vienna, dealer. Note |
| Marcel c.at Anvers | Latin America | Forged, also on forged |
| Marchand, André | . | France, 1916–97, AIEP 1970–75 |
| Marchand, G. | France | Paris 1949, dealer |
| Marchand, Jean-Claude. Certif | Switzerland | Geneva, b. 1960, dealer, expert 1981–, SBPV 1984–, AIEP 1994–, BPP 1991, [FFE4, PE] |
| Marco, Martin | Rumania, Turkey (Levant), Israel | Tel Aviv, b. 1911, dealer, expert 1948–, AIEP 1981–, [FFE5] |
| Marconnet, M. | France and Colonies | Nancy 1897 |
| Marcus, M. H. Advert. | Turkey | Istanbul 1905, dealer |
| Mare (Mares) | Czechoslovakia | Czechoslovakia, pre-WW2 |
| Maresch, Wilhelm H. P. | Canada, BNA | Toronto, b. 1926, dealer, expert 1956–, AIEP 1976–, [FFE3, PE] |
| Margue, Claude | France and Colonies | Paris, AIEP 1964–87 |
| Marimian | Br. Colonies, Fr. Colonies, Worldwide? | British dealer? |
| Marjanovic (script, two versions) | Yugoslavia | Yugoslavia, expert c. 1960– |
| Markovits, Robert L. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Markstein, József | Hungary (air mails) | Budapest, expert comm. chairm. |
| Marque Garantie – Soc Mis – | Hungary (on all 16
Nov. 1919 ovpt.s; see cat.s) | Genuine mark is in same colour as stamp |
| Margue, Léon-Pierre | France and Colonies, Europe | See Miró, Léon |
| Marquelet | French Colonies | France?, dealer |
| Marriott, Sir John B(rook) | . | Guildford (GB), 1922–2001, RPSL Expert Committee 1965–, AIEP 1986–2000 |
| Martin, Col. D. R. (manuscript) | Pakistan (ovpt on India) | Great Britain |
| Martin, Felix | Germany (air mails) | Chemnitz 1950 1961, 1890–c.1956, AIEP 1956–c.56 |
| Martinkovic, J. | Yugoslavia (SHS) | Zagreb, Federation Chairman |
| Marx, Dr. | German States | . |
| Marxer, Peter | Liechtenstein | Vaduz, SBPV 1988–, BPP 1990– |
| Marziano, Pascal. Certif. | France (modern specialities 1940–) | Cap d'Ail (F) 2007, ASPPI. Note |
| Massah, R. (in manuscript) | Samos | . |
| Matheisen, Karl-Heinz | Memel | Neuss, BPP 1984 |
| Matl, Albert. 2 | Austria (incl. PO Levant and Crete), Lombardy-Venetia, Turkey, Japan | Vienna, b. 1924, expert 1963–, BPP 1976, AIEP 1964–, VÖB, [FFE5, PE] |
| Matsumoto, Jun Ichi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Mattila, Esa | Finland (preadhesive postal history) | Espoo, Finn. Phil. Fed. 2009– |
| Matsumoto, Jun Ichi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Matz, Billy. BM | CSA, USA (Tennessee postal history) | USA 2000 |
| Maury, Arthur (in manuscript). Picture | Worldwide | Paris, 1844–1907, dealer, also a company f. 1860 (cf. Lemaire), [Tyler] |
| Maus, Julius | Ionian Is. | Baden-Baden 1935, 1855–1935 |
| Mavrogordato, Pierre (Peter) | Russian PO Levant | Römhild 1936, Vienna, Lausanne 1926, 1870–1948, exhibitor. Note |
| May, U. | German States (Bavaria) | . |
| Mayer | Hungary (Debrecen) | Also on forged, [Flasch] |
| Mayer, Friedrich | Yugoslavia (1918–29) | Munich-Pasing 1961, expert 1950–, BPP 1958– |
| Mayer, Henry | Germany East | Uelzen, b. 1964, BPP 1998– |
| Mayer, Max J. | Japan (excl. occ.s) | Munich, Obergünzburg, BPP 1977–97 |
| Mayer, Stephan, Dr. | Austria (cancellations) | Vienna 1928 |
| Mayer, O. | Rumania occ. Kolomyya etc. | Vienna, dealer |
| Mazepa, James | Ukraine | USA, collector's mark, UPNS |
| Mazo, Jorge S. del | Argentina | Buenos Aires, 1899–1982, AIEP 1971–82 |
| Mazurek, F. J. | Czechoslovakia | Owner's/dealer's mark, Polish? [P.Hoffm.] |
| MDR | Malaya (Japanese occ.) | See Rowell |
| Medcalf, Don | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Mefesz Sopron, cf. MF | Hungary (Sopron 1956) | Students' league, [Flasch 17, 117] |
| Megyeri, Ferenc ('MF' in circle) | Rumania (Regatul), Hungary (Debrecen) | Oradea, [Flasch 118] |
| Mehlmann, Volker | German States (NDP and Alsace-Lorraine) | Dormagen, BPP 1991 |
| Meier, Heinrich | German States (Prussia) | Munich, b. 1928, BPP 1969–80 |
| Meiners, Roland | German South West Africa | Cologne, BPP 2001 |
| Meinertzhagen, Louis Ernest | France | London 1926, 1887–1941, RPS Expert Comm. BPT WhoWasWho |
| Melnikov, Leonid | Russia incl. pre-adh., Soviet Union | Moscow, 1936–2004, expert 1983–, AIEP 1997–2004, [FFE7, PE] |
| Mendelsohn Paris, B. | France and Colonies | Dealer? |
| Menge, Heinz | . | Dusseldorf, 1886–1595, BPP 1958–, AIEP 1954–59 |
| Menzinsky, Dr. Georg. Photo | Finland, Sweden | Djursholm (Sweden) 1961, d. 1981 |
| MEPSI | Mexico | Mexico Elmhurst Phil. Soc. Int., USA |
| Merkel | Germany East | . |
| Merkur | Br. Guiana | 1973 |
| Merschkötter, Dr. | Germany (1945 locals) | . |
| Mertens | Great Britain | Two dealers in Brussels 1949 |
| Mertes, Albert | Saar | Sulzbach (Saar) 1949. Note |
| Metzer | German States | . |
| Metzger, Steven | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Meyer, Bernd | Germany (Infla incl. Official) | Chemnitz 1991 2003, b. 1940, expert 1988–, BPP 1990– |
| Meyersburg, Robert B. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| MF (in dotted circle), cf. Mefesz | Hungary (Sopron 1956) | . |
| MF (in full circle) | Rumania (Regatul), Hungary (Debrecen) | See Megyeri |
| MG | Russia (areas) | On forged |
| MHP | Mongolia | . |
| Michalsky | Malaya (Straits Settlements) | . |
| Michaux, Albert | Belgium | Auvelais (B), b. 1962, auctioneer, expert 1998–, AIEP 2003–, [FFE7, PE] |
| Michel ('Echt Hugo Michel Apolda'), 2 (1917). Advert. | Europe, Worldwide | Hugo Michel-Triller, Apolda 1910, Weimar 1917 1926, 1866–1944, dealer, cat. publisher/editor. Note |
| Michelsen, Dr. G. | Colombia, South America | Hamburg 1897 |
| Micoulsky, Jean de | . | France, 1901–69, AIEP 1969 |
| Miehe | French PO Levant | . |
| Mieländer, Gerhard | Estonia | Berlin-Britz 1961, BPP 1968 |
| Miertl. Note (forgeries) | Hungary (Baranya) | Gyula (Julius) M., Pécs 1920, dealer, recogn. expert, [see Flasch 119] |
| Migliavacca, Dr. Giorgio. Note | Italy and areas, Br. Virgin Is., Iran (Persia), etc. | Tortola BVI, auctioneer 1967–, expert 1973– |
| Mihon ('sample, specimen') | Japan (on forged) | See Japan |
| Mikstein, S., mkstn (early mark); Mikstein (in script), 3. Note | Poland | Prof. Stanislaw M., Cracow, 1888–1956, expert c.1930–; forged (the one in script) |
| Mikulski, Zbigniew.
Certif. The mark "Mikullski" is a forgery. | Poland, Russia incl. occ.s | St. Gallen (until 1964 Warsaw), b. 1925, expert 1951–, AIEP 1960–, VÖB 1982–, [FFE1 3 (p.178) 5, PE] |
| Milgram, James W., MD | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Miltner, Milos | Czechoslovakia (Scout stamps) | Neuenhof (CH), 1980s, dealer |
| Minarik, Jan | Czechoslovakia | Prague, b. 1881, dealer –1931 |
| Miranda de Mota, José Manuel | Portugal and areas | Portugal 2005, Inexfip chairman |
| Miró, Léon (Miro) (The trading name of Léon-Pierre Margue) | France and Colonies, Europe | Paris, 1894–c.1975, dealer c. 1930–65, AIEP 1968–75. Note |
| Mirza-Hadi | Iran (Persia) | See Hadi |
| Misteli, Prof. Charles | Switzerland (UN, Int. Org.) | Geneva 1950; collection is in the UN Geneva Postal Museum since 1962 |
| Miszczak, Maciej | Poland | Wroclaw 2000, Polish Fed. |
| MK | Hungary | [Flasch] |
| MK (in circle) | Czechoslovakia | [P. Hoffmann] |
| mkstn | Poland | See Mikstein |
| Möbs, Theodor. (= Moebs). Photo | Czechoslovakia, Bohemia & Moravia | Frankfurt/Main, 1897–1978, BPP 1958–, AIEP 1954–67 |
| Modry, Dr. Fritz (forged), 2 | Germany East (Bezirk 1948) | Wernigerode (DE), b. 1933, BPP 1991 |
| Moeller, Carl Aage | Denmark, Greenland | See Mřller |
| Moens, Jean-Baptiste | Worldwide | Brussels, 1833–1908, famous dealer, [Tyler] |
| Mogler, Gustav | Germany (field post Mi 1–4) | Frankfurt/M., BPP 1984 |
| Möhle, Heinz | German occ. Channel Is. | Hamburg, BPP 1976 |
| Mohrmann, Edgar. Certif. | Scandinavia, Worldwide (pre-1900) | Hamburg 1943, 1897–1964, BPP 1961, AIEP 1954–64 |
| Mojaddedi ('M.S.M.') | Saudi Arabia | Mohammad Sadik Al-Mojaddedi, Djeddah |
| Mokuku ('forged') | Japan | See Japan |
| Moldenhauer jr, Frantz C. | Norway (excl. locals) | Minde (Norway), 1920–1999, dealer, expert c. 1965–90, AIEP 1970–99, BPP 1980 |
| Molesworth, Jack E. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Mřller, Carl Aage (Moller, Moeller) | Denmark, Schleswig-Holstein, Iceland, Greenland, Danish WI | Greve Strand (DK), b. 1956, expert 1986–, AIEP 2000–, BPP 2001, [FFE4 5, PE] |
| Monclús, Tomás | . | Barcelona, c.1890–c.1965, AIEP 1954–c.56 |
| Mondolfo, Renato | Italy and States, Trieste, Czechoslovakia, Europe | Trieste 1950, Rome 1961, 1918–92, AIEP 1954–92 |
| Monge Pineda, Pedro | Spain and Colonies | Barcelona, 1890–1965, dealer, AIEP 1954–65. Note |
| Monori, Pavel | Hungary | Czechoslovakia, 1907–85, SCSF expert |
| Monteaux, Georges | France 1900– | Paris, AIEP 1970–90 |
| Moorhouse, Brian | South and Central America | Peterborough (GB) 2001, dealer. Note |
| Morandi, Dr. Giancarlo | Italy (1945–) | Cremona, BPP 2003 |
| Morgoulis, Paul | Portugal and Colonies | Paris, c.1900–90, AIEP 1974–90 |
| Moritz, Rud. | Malaya, Worldwide? | Frankfurt, dealer |
| Mosch, Semo | Rumania | Giurgiu pre-WW2, collector's advert. |
| Moschkau, Dr. Alfred | Worldwide | Germany, 1848–1912, expert 1871–77, [Brühl p.481] |
| Moser, Biel, F. (Moser-Räz), 2. Certif. | Switzerland | Fritz Moser-Räz, Biel (Switzerland), 1907–90, AIEP 1958–74 |
| Moskauer Briefmarken-Sammler | Russia incl. Zemstvo and PO Levant, Finland, Poland | Moscow 1897, phil. society |
| Mosonyi | Rumania (Regatul) | Also on forged, [Flasch] |
| Mozek, Dr. Christian | German States (Bergedorf; Vineta) | Willich, BPP 2001 |
| Mozian, van ('VM') | Armenia, Azerbaijan, Georgia | New York NY dealers/auctioneers Vahan Mozian Inc? 1901–c.1950, also on forged |
| Mozo ('imitation') | Japan (on forged) | See Japan |
| Mozu | France and Colonies, Portugal | . |
| MP (in circle) | Fiume, Hungary, Yugoslavia (locals) | On forged only, [Flasch 122] |
| Mrdja, Miodrag | Yugoslavia and areas | Belgrade 2004, Phil. Assoc. Serbia & M. |
| Mrnák, J (in script), (+forged, 2). Photo. (Mrnak) | Czechoslovakia | Jan Mrnák, Czechoslovakia, 1903–68, expert 1937–1940s, AIEP 1960–68 |
| MS | Iran | See Sadri |
| MSM | Saudi Arabia | See Mojaddedi |
| Mueller, Edwin | Worldwide | See Müller |
| Muenz, Geo. H. | Palestine, Israel | See Müntz |
| Muis, C. | Netherlands and Colonies | Expert, d. c. 1990, NVPH/NVRH (Dutch Association of Stamp Dealers) |
| Müller (Muller, Mueller) | Iceland | . |
| Muller (Müller, Mueller) | Poland | Also on forged |
| Müller, Edwin (=Mueller). Photo. [See APS Hall of Fame.] | Europe, Austria (pre-1918, incl. PO Levant) | Vienna –1938, New York NY 1950, 1898–1962, expert 1935–, Friedl Expert Comm. NY, AIEP 1956–62 |
| Muller, (Raymond) Frank | Worldwide (air mails) | Les Lilas, Royan (France), 1900–84, AIEP 1958–84 |
| Müller, Hanfried (Muller, Mueller) | Germany (field post Mi 1 and Tunis) | Heidelberg, BPP 1991 |
| Müller, Hans (Muller, Mueller) | Heligoland | Hannover 1897 |
| Müller, Julius (Muller, Mueller) | Germany (1945–6 locals) | Berlin-Spandau, 1901–91? |
| Müller Leobschütz, Dr. Harry (in rectangle or in oval) (Muller) | Germany (Upper Silesia) | Leobschütz (Germany), 1878–1944, often on forged. Note |
| Müller, Milos (Muller, Mueller) | Czechoslovakia | Bratislava, expert 1939–1970s |
| Müller, Rolf Frieder (Muller, Mueller) | Germany East (Bezirk 1948) | Dresden, BPP 1991 |
| Müller–Basel (Muller, Mueller) | . | Dealer Ernest M.? (t.a. Müller & Scheurer), Basel, pre-WW2 |
| Müller-Mark, Ewald (Muller-Mark) | German States | Berlin-Lankwitz 1950, b. 1902 |
| Munk, Dr. Herbert | (Fiume?) | Berlin, Lugano, 1875–1953, editor Kohl's Handbook |
| Müntz, Hans Georg (Muntz, Muentz) | Palestine, Israel | Tel Aviv, 1918–2002, expert 1965–2000, BPP 1978–90, AIEP 1978–2002, [FFE3 4] |
| Murray Payne Ltd. Certif | Br. Colonies (George VI) | Axbridge GB, experts Richard (Dickon) Pollard and Stuart Babbington |
| Mza-Hadi | Iran (Persia) | See Mirza-Hadi |
| N (in blue): shade of colour | Belgium and Colonies | See Soeteman, additional marks |
| Nakri, Yakup | Turkey | Istanbul, b. 1962, expert 1995–, AIEP 2003–, [FFE7, PE] |
| Narita, Hiromu | Japan | Japan, ECPM (q.v.) 2001 |
| Narodnyi Komissariat ... | Russia | See HKBT |
| Nasmi | Turkey | . |
| Nauri (in script) | Turkey | See Nouri |
| Navarro Payá, Alfredo | Spain (postal forgeries) | Pontevedra, b. 1925, expert 1970–, AIEP 1978–, [FFE2 5, PE] |
| ND (in blue): genuine imperforate | Belgium and Colonies | See Soeteman, additional marks |
| ND (G.: Neudruck; Nachdruck) | Worldwide | Common mark for reprints |
| Nederl. Bond van Vereen. van Postzegelv. | Netherlands | Amsterdam 1950, (Dutch phil. federation) |
| Nederlandsche Postzegelveiling B.V. | Worldwide | Amsterdam 1979, auction house |
| Neinken, Mortimer L. | USA | New York NY, 1896–1984, PF chairm. |
| Nekvasil, Jiri | Czechoslovakia (postal history) | Czechoslovakia, 1921–88, SCSF |
| Nemvalz, Valdo | Estonia | Johanneshov (Stockholm) 2001, 1922–2003, [Eesti Filatelist #39 p. 226] |
| neprodejné | (Czech for 'unsaleable') | (Strange use on a faultless stamp.) |
| neudruck | Worldwide | German for Reprint (not an exp. mark) |
| Neufeld | Austria | . |
| Neumann, Till | German States (Bremen) | Bremen, b. 1972, dealer, BPP 1997–, AIEP 2004–, [FFE8] |
| Newiger, Dieter | Italy, Italian States (Sardinia), Japan (excl. occ.s) | Berlin, b. 1941, BPP 1991 |
| Ney, Christine | Saar (Mi 53– incl. Officials) | Saarwellingen, BPP 1991 |
| Ney, Herbert | Saar (Mi 1–52) | Saarwellingen, BPP 2004– |
| NG | Hungary | Also on forged, [Flasch] |
| Nicolaides, N. S. (in script) | Greece | Greece? |
| Nickel, Jürgen | German States (Thurn & Taxis) | Nauen, BPP 1991 |
| Nicklin, John W. | Armenia, Azerbaijan, Georgia | New York NY 1949, dealer, also on forged |
| Nielsen, Gunner Lundegaard | Denmark | Denmark 1969 |
| Nielsen, Lasse | Denmark, Europe | Copenhagen 1999, indep. expert. Note |
| Noël, Gilbert | France (cancellations) | Cathou (France), 1920–92, AIEP 1970–92 |
| Norris, Andrew | Malaya | England 2003, BPA expert committee |
| Norsten, Karl-Arne; 'KAN' | Sweden (1920–36) | Stockholm 2008, dealer, active |
| North Western Army | Russia (NW Army) | On forged |
| Nouri, M. | Turkey | Istanbul-Stamboul, pre-WW2, dealer |
| Noury | Syria | Same as Nouri? |
| Novak, D. | Yugoslavia (ovpt. Bosnia and Slovenia) | Giessen, BPP 1991 –2004 |
| Novak, Frantisek | Rumania | Czechoslovakia, 1897–1971, AIEP 1961–71, CSF 1960– |
| Novak, Roland | Germany (Bizone Bauten) | Giessen, BPP 1984 |
| Novakovic, Dr. Brana ('H9' in circle) | Yugoslavia (WW2) | Expert of the Yugoslav Phil. Society c. 1977–90 |
| Novotný, Ladislav (Novotny) | Czechoslovakia, Bohemia & Moravia | Bratislava, 1901–81, SCF 1957– |
| Nussbaum-Bisser, André. Certif. | Switzerland (1843–62) | Basel, 1908–88, BPP 1968, AIEP 1966–88 |
| Nyáry, L. | Hungary | Budapest pre-WW2, ollector's advert. |
| Nykvist, Göran. Photo | Finland (postal stationery) | Kauniainen, 1932–12.2.2006, Finn. Ph. Fed. 1996–2006 |
| Nyman, Arnold | France | Helsinki, b. 1916–2006, Finn. Phil. Fed. 1981–2004 |
| O | Hungary | See Odor |
| OB (in blue): genuine cancellation | Belgium and Colonies | See Soeteman, additional marks |
| Obermüller, Franz | Sweden | Stockholm, b. 1906, dealer (Kihlströms Frimärkshandel, f. 1933), expert |
| Obermüller-Wilén, Dr. Helena (=Obermueller Wilen). Certif. | Sweden (1855–1919) | Huddinge (SE), b. 1942, expert 1985–, BPP 1994–, AIEP 1996–, [FFE2 3, PE]. Note |
| Odenweller, Robert P. | New Zealand, Samoa (pre-1900), (Australia) Tasmania | Barnardsville NJ, b. 1938, expert 1968–, AIEP 1980–, [FFE3, PE] |
| Odor, Johann/Jean (also 'O') | Hungary (ovpt), Rumania (Regatul), Russia (Armies), Ukraine | A forger, [Flasch 126] |
| Oechsner, Dr. Helmut P. | Germany (Infla incl. Official, Bavaria Infla, Germania issues), Danzig | Nuremberg, b. 1951, expert 1974–, BPP 1976, AIEP 1991–, [FFE3, PE] |
| Oertel, Dr. | Germany & Col., Heligoland, Albania | . |
| Oesch, Herbert | Finland | Espoo, 1925–2006, Finn. Phil. Fed. 1981–2006 |
| OFK | Norway | See Oslo Filatelist Klubb |
| Ohrt, Major Paul | German States (Oldenburg, Bremen), Worldwide (reprints) | Düsseldorf 1926, 1867–1944 |
| Ohshima, Masaaki | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Okday, Ismail Hakki | Turkey | (One IHO: Istanbul, 1881–1977) |
| Olamo, Juhani (V.) | Finland, Ecuador | Helsinki, b. 1940, Finn. Phil. Fed. 1981– 2001 2006–, AIEP 1998–, [FFE3, PE]. |
| Oldrow, K., Exp. | Ukraine | Collector and expert, [UPNS] |
| Olendski, S., Riga | Ukraine | Riga, [UPNS] |
| Oliva, Bruno Savarese | Italy | See Savarese Oliva, Bruno |
| Oliva, Guglielmo. Certif. | Italy and States, San Marino, Ital. occ. Fiumano-Kupa, German occ. Ljubljana, Fiume, Albania, Spain (pre-1920) | Genoa 1949 1961, 1900–1969, dealer from 1920s, great expert, AIEP 1954–69 |
| Oliveira Pinto, Fernando de | Portugal and areas | Portugal 2005, Inexfip member |
| Oliver, F(rank) H. | Greece, Heligoland, Luxemb., Worldwide | London 1926, b. 1867(66?), dealer, BPA expert |
| Ońate (Onate) | Spain | See Cajal Ońate |
| O'Neill, Fred | Costa Rica | Asoc. Filat. de C. R. 2001 |
| Onofri, Mario | Worldwide (Zeppelin) | Italy, 1895–1968, AIEP 1958–68 |
| Opitz, Walter A. (forged) | German States (Prussia, Saxony, Thurn & Taxis) | Netzschkau 1920 1935 1950, Oberhöch- stadt/Taunus, 1877–1968, BPP 1958–, AIEP 1956–68 |
| Oprysko, Modest M. | Ukraine | Baldwin Place NY 2001, UPNS expert |
| Orbán, Ferenc (Orban) | Hungary | Silkeborg (Denmark), 1924–98, AIEP 1981–84 |
| Orenstein, Jonathan | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Ores, J. | Poland (Cracow 1919) | Also on forged |
| Orestis Vlastos | Greece | See Vlastos |
| Oroszi, K. | Rumania (Regatul), Hungary (Western Hungary) | On genuine, [Flasch] |
| Orth, Dr. F. Alfred | Mongolia (pre-1945), Tibet | Bad Hersfeld (Germany), 1925–93, BPP 1980, AIEP 1983–93 |
| Örvös, János ('JÖ' in triangle) | Hungary (esp. Debrecen I) | On genuine, [Flasch] |
| Oslo Filatelist Klub (OFK) | Norway | Oslo 1950 |
| Osper, Horst | Denmark, Danish WI, Faroes, Greenland, German occ. Sudetians | Borken (later Thailand), BPP 1991–2005 |
| Ossa, Mikko (in manuscript) | Finland | Kokemäki (formerly of Turku), b. 1939, Finn. Phil. Fed. 1981–93. Note |
| OTW | Rumania (Regatul) | On genuine, [Flasch] |
| Paaskesen, Erik E(gtved) | Denmark, Faroes, Danish West Indies | Brussels, 1949–2000, dealer, AIEP 1991–2000 |
| Pacreu, E. | Spain | Barcelona, dealer |
| Paetow, Hans-Hermann | German occ.s Bohemia & Moravia and Poland (GG) | Bremen, b. 1931, expert 1990–, BPP 1996, AIEP 2003–, [FFE7, PE] |
| Pagnoncelli, Ernesto. Certif. | Italy | Rome 1970s, dealer |
| Pahlman, Heikki | Finland (pre-philately) | Tampere, d. 2006, Finn. Phil. Fed. 1996–2006 |
| PAK (lightly in pencil) | Confederate States | See Kaufmann, Patricia A. |
| Pákozdi, László (Pakozdi) | Hungary | Hungary, [Flasch 166] |
| Palacek, W. | Czechoslovakia | Prague |
| Palazolo, Jerry S. | Confederate States | USA 2000 |
| Pape, Heinz. Note (forged) | Hungary, Fiume, Rumania (Regatul), Yugoslavia (SHS) | Used by Géza Tarján, dealer, forger, [Tyler, Flasch 130] |
| Pape, Herbert | Japan (excl. occ.s) | Erfurt, 1921–96, BPP 1991 |
| Pappadopulo (in boxed P), SP (in circle). Stephan Aristol P. | Russia (Siberia), China | Vladivostok c. 1918–22, Shanghai 1923–48, 1880–1953 (b. 1885?), dealer. Note |
| Paprstein, Vladimir | Czechoslovakia | Czechoslovakia, d. 1958, USCF expert |
| Papuçcuoglu, Bülent (Papuccuoglu) | Turkey | Turkish Phil. Fed. 2001. |
| Pardo, Flavio | Italy, Trieste | See San Giusto, Filatelia |
| Pascal ? | French Colonies | . |
| Pascanu, Leonard. Photo | Rumania (excl. Moldavia & Wallachia) | Bucuresti, b. 1952, expert 1985–, AIEP 1998–, [FFE3, PE] |
| Passer, Adolf | Turkey, Bosnia & Herzegovina | Prague, 1865–1938 |
| Pataj Sándor | Hungary (Western Hungary) | An owner's mark, [Flasch] |
| Pátkai (Patkai) | Fiume | On genuine, [Flasch] |
| Paul, Siegfried | Germany East (Mi 182–241 and DDR) | Berlin, BPP 1995– |
| Pauligk, Dr. Karl | German New Guinea (excl. GRI), German PO Morocco | Freiberg, BPP 1991 |
| Pavoille (boxed, three lines: PA VOI LLE), also: Pavoille Paris (two lines) | France and Colonies, Hungary, Belgium | Emile P., Paris 1926, dealer, also on forged, [Flasch] |
| Payá (Paya) | Spain | See Navarro Payá |
| Pazout, Pavel | Czechoslovakia (1945–) | Praha, dealer (Profil), SCF 2001 |
| Pearson, Patrick C. (Works as member of committee.) | Ceylon, Hong Kong, Iraq, W. Australia | London, b. 1930, expert 1965–, AIEP 1990–, [FFE1 3 5 6, PE] |
| Peinelt | Germany (incl. all areas) | Germany |
| Pelander, Carl E(inar) | Finland, Iceland, Scandinavia | New York NY, 1894–1966, dealer. Note |
| Pelczar, Piotr | Poland | Koszalin 2000, Polish Fed. |
| Peleeheid Paris | Brazil | Paris, dealer? |
| Peltonen, Lauri ('LaPe') | Finland | Hanko (Finland), dealer, in use 1930s |
| Pemberton, Edward L(oines) | Worldwide | England, 1844–78. BPT WhoWasWho |
| Pemberton, Percival Loines | Greece, Worldwide | London, 1875–1949, BPA expert, son of E.L. BPT WhoWasWho |
| Penning, Dr. Hans-Karl. Photo (3rd fr. left, at right Firma Köhler repr.), 2 | Germany (1945–6 certain locals) | Bornheim, b. 1941, BPP 1981–, [FFE6] |
| Peoples, Dennis | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Perrain, A. R. | Russia (areas), Hungary (on forged ovpt) | France, dealer, [Flasch 137] |
| Perzynski, Maciej S. | . | Poland, 1907–77, AIEP 1961–77 |
| PESA | Worldwide | Philatelic Expertizing Service of America Inc., 1984 (12 mo.), APS, ASDA, GPS |
| Peschl, Eduard (forged; the first), 2 | Germany (Germania issues, 1915–45 incl. Infla) | Passau 1950, 1903–99, BPP 1961, AIEP 1954–95 |
| Peters, Herm. | German States (Mecklenburg-Schwerin) | Bremen 1897 |
| Peters, Markus W. E. | Albania | Göppingen-Hohenstaufen, b. 1968, expert 1994–, AIEP 2002–, [FFE6, PE] |
| Peters, Oskar Erich, 'O.E.P.', trident | Ukraine | Rabenstein 1950, Chemnitz 1920 1961, b. 1884, 1920s expert, UPV |
| Petersen, Dr. E. N. (forged) | Memel | Neunkirchen-Seelscheid, BPP 1976 |
| Petric, Nicola | Yugoslavia, Fiume, Hungary (Baranya) | Zagreb |
| Petriuk, Stefan | Poland incl. locals and Polish Corps | Langballigholz, BPP 1991, Polish Fed. |
| Petrocelli, David | France | New York NY 2001 |
| Petrovic, Bogdan | Yugoslavia and areas | Belgrade 2004, Phil. Assoc. Serbia & M. |
| Petry, Claus | Germany (Mi 31–52, Field Post 17) | Hamburg, b. 1965, BPP 1996 |
| Pettersson, Olle | Sweden | Stockholm, dealer |
| Petzold, Volkmar | Germany East (Bezirk 1948) | Dresden, DDR expert 1985–1990, BPP 1990–2005 |
| PF. Certif. | USA, Central America, South America, Worldwide | Philatelic Foundation, NY, 1945–, [FFE2 (p.173) 3, PE]. Note |
| Pfä. [German: Postfälschung] | Worldwide, especially German area | On postal forgeries in addition to name |
| Pfaff, C. | German states | Hannover 1897 |
| Pfalz, Dr. R. | . | VÖB honorary member |
| Pfeiffer, Detlef | German occ. Poland (GG) | Gäufelden-Öschelbronn, BPP 2001 |
| Pfenninger, Franz (forged, another forged) | Germany incl. States (esp. Bavaria) and Colonies, France, French Colonies (–1886), Europe (–1900), Egypt, Sudan, Japan, Worldwide (–1900) | Munich 1950, 1905–86, BPP 1958–, AIEP 1954–86 |
| PFSA | South Africa, Worldwide | Philatelic Federation of South Africa |
| PhA USSR (within an 'S') | Russia (and areas), Soviet Union | See Soviet Philatelic Association |
| PhB (cf. ürményi) | Hungary (Debrecen) | See Banater Philatelist |
| Philatelia Krakow | Poland (Cracow 1919), Ukraine | Cracow pre-WW2, dealers. Mostly on forged [Stallberg] |
| Philatelia Subotica, 2 | Hungary, Yugoslavia (SHS) | Szabadka, dealer, on genuine, [Flasch] |
| Philatelic Museum | Japan and occ.s, Manchukuo | Tokyo 2005, Expert Committee. Note |
| Philatella Dortmund | Ukraine | Germany, also on forged |
| Phillips, David G. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Pickenpack, Werner (forged, forged) | Germany (field post and occ. France & Ukraine) | Hamburg, BPP 1961 |
| Piechotte, Max ('P.X.M.') | Germany and States | Berlin, dealer or collector mark |
| Piekut, Janusz Zbigniew | Poland | Warsaw 2000, Polish Fed. |
| Pieper, Dr. Hans | Worldwide (telegraph) | Kirchheim, BPP 1976 |
| Pietilä, Juhani | Finland (postal stationery) | Turku, b. 1941, Finn. Phil. Fed. 1990– |
| Pietz, Friedrich | German States (Bavaria pre-adh.) | Nuremberg, BPP 2001 |
| Pigeron, Xavier | France | Paris 2002, dealer 1964– |
| Pileur, Jacques Le | France | Paris 1943, 1880–1969. Note |
| Piller, Stanley M. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Pimian, I. V. (?) | Luxembourg | . |
| Pinchot, S. | Worldwide | 1980s |
| Pineda, Pedro Monge | Spain and Colonies | See Monge, Pedro Pineda |
| Pirl, Dr. P. H., 2 (Paul H. Pirl) | Russia, Heligoland, Iran (Persia), Japan, Transvaal, Worldwide | Berlin-Charlottenburg 1935, 1873–1947, expert since very early 1900 |
| Pit, D. M. (in square) | Yugoslavia | . |
| Pittermann, Pavel. Photo | Czechoslovakia, Bohemia & Moravia, Slovakia. Also on forged | Prague, b. 1942, expert 1984–, CSF exp. chairman –2004, AIEP 1996–, [FFE2 3, PE] |
| PJB (Postás Jóléti Bizottság) | Hungary (coronation of Charles IV stamps) | Post Charity Committee; on front of stamp |
| Plamsch, Adolf | Central Lithuania, Russia (Wenden) | Grodno 1935, b. 1866 |
| PLC | Armenia, Azerbaijan, Georgia | Also on forged. |
| Plko, tefan (Plsko) | Denmark, Danish WI | Detva (Slovakia), SCF 2001 |
| PM (or MP?, monogram) | Samoa, Australia (Queensland) | On genuine and on forged |
| PN (in oval) | Fiume, Hungary (ovpt) | On forged, [Flasch] |
| Poburenny, Stefan, 'PS'. Note | Western Ukraine, Russia etc. | PO civil servant in W. Ukraine, on forged |
| Podlog (etc. beginning with 'Pod...') | (in Cyrillic letters) | Russian for 'Forgery' |
| Pofis, 2, Pofis-Bene | Czechoslovakia, Bohemia & Moravia | See Bene |
| Pohl, Waldemar (Woldemar?) | Russia (incl. Armies and PO abroad), Estonia, Ukraine, Armenia (excl. Z- & monogr. ovpt), Azerbaijan, Georgia, Batum | Bamberg 1950, 1903–69, BPP 1961, generally reliable, also on forged |
| Pollard, Richard (Dickon) | Br. Colonies (George VI) | England 2001, dealer (see Murray Payne), BPA expert committee member |
| Pollmer, Dr. Gottfried | Germany (1945 Meissen local) | Meissen, BPP 1991 |
| Ponsio, Ilmari ('IP') | Finland | Tampere, dealer, in use 1930s |
| Poon, Kam Leung. (Works as member of committee.) | China incl. all areas, Hong Kong, Macau, Taiwan (Formosa) | Hong Kong, b. 1936, expert 1995–, AIEP 2000–, [FFE4, PE] |
| Popa, S. Andreas | Danzig | Schleswig 1950 |
| Popielewski, Lech | Poland | Torun 2000, Polish Fed. |
| Poppers | Ukraine | . |
| Popoff | Ukraine | Kyiv, later Moscow, collector |
| Pordo, Friedrich | Brazil | Rio de Janeiro 1897 |
| Pos, Gregory (Cyrillic 'P' in circle) | Ukraine 1918 (also 1992 ovpt) | London, expert since 1970s |
| Poser, Dr. Richard | Italian States (Papal States and Romagna) | Braunschweig, BPP 1961 |
| posthorn | Cechoslovakia | See Zampach |
| Pothion, Jean-Jacques | France (cancellations, pre-adh.) | Paris, 1918–87, AIEP 1970–82 |
| Pothion, V. (Vincent) | France | Paris, b. 1950, dealer, [FFE2] |
| Pötzsch | Germany (1945–6 certain locals) | . |
| Poula * Paris (in circle) | Europe, Hungary etc. | René Poulain, Paris, b. 1887, dealer. Note |
| Poulie, Jan | Netherlands | Amsterdam 1949 1961, Aubonne (Switzerland) 1978, 1907–81, AIEP 1960–81. Note |
| Powell, Peter W. W. | Confederate States | USA 2000 |
| Prasil, Vaclav | Czechoslovakia | Prague, dealer |
| Prehnalek, Erwin | Hungary, Czechoslovakia | Also on forged, [Flasch] |
| Prendushi, Zef ('ZP' boxed). Letterh. | Albania, Epirus, Turkey | Skutari, dealer c. 1928–42, also on forged |
| President | Japanese occ. Burma | On forged only, [Richard Warren] |
| PRHO | Russia (Siberia) | On forged |
| Pritula, V. Vsevolod | Russia (pre-1917), Soviet Union | Moscow 2001, b. 1937, AIEP 1992–99, frequently on forged |
| Prof. Vin (in Russian script) | Russia | See Vinterstern |
| Pröschold, Horst K. W. (Proschold, Proeschold) | German States (Saxony), Great Britain, Ireland, Malta, Cyprus, Gibraltar | Frankfurt/M., 1922–89, BPP 1976, AIEP 1975–89 |
| Protivensky, Miloslav | Czechoslovakia | Czechoslovakia, 1911–70, SCF |
| Provera, Pietro (green sprucetree) | Lombardy-Venetia, Austria | Switzerland (ex Italy), collector. Note |
| Provinsky, Dr. Peter | New Guinea, and Mariana Is. (both German), German PO Morocco | Berlin, BPP 2001 |
| Prüfzeichen falsch | German area (mainly) | German for "Forged exp. mark" |
| Prüss, Max (Pruss, Pruess) | Germany (Zeppelin) | Neu-Isenburg 1950 |
| PS | Togo (Fr.-Eng. occup.) | On stamp w. forged (laser?) ovp (eBay) |
| PS | Ukraine | See Shchapov |
| PSE | USA, BNA, Br. Colonies | Professional Stamp Experts, Florida US, f. 1987, cf. Amer. Phil. Feb. 1998 |
| Ptacovsky, Klement | Czechoslovakia, Slovakia | Bratislava, 1940s, cf. Slovensky F. |
| Pujalto Madrid (?) | South America | Dealer |
| Puloaas, Gunnar ('GP') | Estonia | Tallinn, expert c. 1950–95 |
| Püschel, A. | German states | Berlin 1897 |
| Puschmann, Fritz | Austria incl. all areas | Vienna 2001, dealer (Öfila), VÖB |
| PVK | Bulgaria | See P. V. Karaivanoff |
| PXM | Germany, German states | See Max Piechotte |
| Pytlícek, Ludvík | Czechoslovakia | Semily (Cz.) 2000, b. 1943, collector, in 2003 accused of selling forgeries |
| Pyznar, Richard ('RP') | Germany | USA (East coast), dealer |
| Quast, Albert | Chile, Mexico, Nicaragua; (all pre-1900) | Hamburg, BPP 1968 |
| R (in blue): genuine reprint | Belgium and Colonies | See Soeteman, additional marks |
| R!S! | Armenia, Azerbaijan, Georgia | Also on forged |
| R... ? | Russia (Siberia) | . |
| Rachmanow, Wladimir (von) | Switzerland (Cantons), Poland | Warsaw 1926, Bayside NY 1950, b. 1886 |
| Racic | Yugoslavia (SHS) | Croatia, on genuine, [Flasch] |
| Radanovic, Radenko R. | Yugoslavia and areas | Banja Luka 2004, Phil. Assoc. Serbia M. |
| Radicevic, Djordje | Yugoslavia and areas | Belgrade 2004, Phil. Assoc. Serbia & M. |
| Rafay (in oval, stamped on hinge) | Hungary | [Flasch] |
| Raftopulo, Spiro (Raftopoulos) | Greece | Greece, 1930s. Cf. Raphtopoulos |
| Ragasztó | Hungary etc. | Hungarian for 'forged' |
| Ragatz, Dr. Lowell | Worldwide (forgery researcher) | Madison Wis. 1926, 1897–1978, dealer (Reliance Stamp Co. t.a. George van den Berg) |
| Rainer, H. | . | VÖB honorary member |
| Rajits, N. P. | Albania | . |
| Raphtopoulos, A. | Greece | Greece, until 1970s. Cf. Raftopulo |
| Rapp, Peter | Worldwide | Wil (CH), auctioneer 1970–, member of BPB, q.v. |
| Rappaporte | German Colonies | . |
| Raritan Stamps Inc. | Russia, Soviet Union | Dayton NJ 2006, dealers |
| Rasch | Mexico | . |
| Rasche, Walter | German States (Hannover and Prussia) | Bad Neundorf 1950, Hannover, BPP 1961 |
| Rathausky, Josef | Greece | Czechoslovakia, 1901–83, CSF |
| Rathje, Eigil | Denmark | Copenhagen, 1901–86, AIEP 1954–c.56 |
| Rauh | Argentina, Uruguay | . |
| Ray, Samuel | Palestine, China | Chicago, 1912–92, AIEP 1969–92 |
| Raybaudi-Massilia, Dr. Luigi | Italy and States | Rome 1943, 1913–2003, dealer, AIEP 1954–2002 |
| Raybaudi-Massilia, Maurizio. Certif | Italy and States | Rome 2002, b. 1937, indep. expert, AIEP 1983–99. Note |
| RB | Yugoslavia (SHS) | Perhaps Ruggero Benuzzi (q.v.), [Flasch] |
| RD | Belgium | See Delapierre |
| RDM | Central America | See Duron Membreno |
| Reach, Zikmund | Czechoslovakia | Prague, 1859–1935, dealer |
| Refky, M. A | Mongolia | Seen exclusively on forgeries. |
| Rehfeld | Germany East | . |
| Rehn, Erhard; 'Rehn Hall' | Germany (1945 Saxony locals), Germany East (Mi 212–, prev. also Bezirk 1948) | Munich, BPP 1961 |
| Reine, G. | French Colonies, Hungary, Albania | Germany?, [Flasch] |
| Reinhardt, Werner | Liechtenstein | Chur (CH), BPP 1984. |
| Reinhardt, Theodor | German States (Wurttemberg) | Stuttgart 1897 |
| Reinheimer, A. | German States | Frankfurt 1897 |
| Reinikainen, Heikki | Finland (1875) | Helsinki, b. 1937, Finn. Phil. Fed. 1996– |
| Reinoso, Juan | Costa Rica | San José, dealer, Asoc. Filat. C. R. 2001 |
| Rellstab, Emil | Switzerland (1843–) | Mönchaltorf (CH), 1928–2006, expert 1972–2006, BPP 1976, AIEP 1981–2006, SBPV until c. 2002, [FFE1 2 3 5, PE] |
| Renard, Nicholas | Worldwide (pre-1900) | Mürnau 1950 |
| Rend, Dr. Ferenc | Hungary, Rumania (Regatul) | Budapest, [Flasch 141] |
| Rendon, Alex (Alejandro) (Works as member of committee.) | USA, Bolivia, Colombia | New York NY, b. 1940, expert 1970–, AIEP 1982–, [FFE5, PE] |
| Renggli, Hans-Peter. Certif. | Switzerland. Note | Reinach BL (CH) 2001, SBPV –2002 |
| Renon | Spain | . |
| Rep. (boxed) | Worldwide | The stamp has been repaired |
| Replik (printed; easily erased) | Worldwide | On back of Peter Winter forgeries |
| Ressel, Oskar | Worldwide | Berlin 1943, dealer |
| Reum, Dr. Kurt | German States (Thurn & Taxis) | Meiningen (DDR), 1913–83, AIEP 1972–83 |
| Reuterskiöld, Baron Axel de | Switzerland, Great Britain and Colonies | Lausanne, 1860–1937, philatelist |
| Revaler Philatelisten Verein e.V. | Estonia | Tallinn 1936, expert F. Klemann. Note |
| Revest, A. | Armenia, Azerbaijan, Georgia | Also on forged |
| RF (in circle, with four dots) | Hungary | On genuine, [Flasch] |
| Riba Praha | Czechoslovakia | Prague, dealer |
| Riccio, Dr. Dominick | Carpatho-Ukraine | New York NY 2001, UPNS expert |
| Richardson F (in circle; F= forgery) | Worldwide (forgeries only) | David R., GB, a forgery collector's mark |
| Richter, Alexander | Bulgaria | Ruse (BG) 1897 |
| Richter, Georg (in script or in block), 2 | Worldwide | Berlin, 17.11.1874–22.3.1960, expert c. 1930–60, frequently also on forged. Note |
| Richter, H. | Australia | . |
| Richter, Heinzgeorg. Certif. | Great Britain, Cape of Good Hope, Cyprus, Gibraltar, Ireland, Malta, Mauritius | Wöllstadt (Germany) 1998, independent expert. Note |
| Richter, L. | Hungary | Budapest 1897 |
| Richter, Walt(h)er | German occ.s (Poland, Ober Ost and Etapp. West) | Heidelberg 1950 1961, 1877–1959 |
| Ricotti, Umberto | Fiume | Fiume, [Flasch] |
| Rieger, Dr. Bohus | Europe (pre-1900) | Czechoslovakia, 1895–1977 |
| Rieger, F. | Yugoslavia | Berlin-Reinickendorf 1961 |
| Riep, Oscar | Russia and areas | Berlin, d. 1928, dealer |
| Rijxmann | Germany (1945 locals) | . |
| Ringström, Sigurd (Ringstrom) | Worldwide (locals), Iceland | Trelleborg (Sweden), 1908–92, philatelist, author |
| Rinsch, Heinrich | German States (Bremen), Heligoland, Italy (Meran), German occ. Libau, Poland, Russia, Soviet Union | Essen-Stadtwald 1950, 1890–c.1975, BPP 1961, AIEP 1954–75 |
| Risigari, L. | Italy and States | Rudolstadt 1897 |
| Rismondo, Tilo. Certif. | German States (Saxony), Austria (pre-1918) | Chemnitz, b. 1938, BPP 1991, VÖB |
| Ristic, Jovan | Yugoslavia and areas | Belgrade 2004, Phil. Assoc. Serbia & M. |
| Ritter, Franz | Germany (Infla) | Munich, BPP 1958– |
| Ritter, Hermann | Switzerland, Heligoland, Turkey, Germany and States (–1944), German Colonies, Danzig, Memel, Saar, Liechtenstein | Zurich 1949, official expert 1949 |
| Rjaci | Fiume | On genuine, [Flasch] |
| RJC (also in oval). Note | Russia (areas), etc. | See Ceresa; in use pre-1970 |
| RJT (in manuscript) | Saudi Arabia | See Thoden |
| Robert | Germany (field post WW2) | Germany? |
| Robert, J. B. | Netherlands | The Hague 1897 |
| Roberts, C. W. (Cecil William), also in script, 'CWR' | Russia (areas), Ukraine | Great Britain, 1899–1974, AIEP 1959–74, [UPNS] |
| Robertson, Peter A. | . | USA, b. 1943, AIEP 1987–94 |
| Robles, Roberto | Guatemala | Quezaltenango, dealer |
| Robineau, F. A. | France (and areas), Saar, Great Britain | France 1966 1990 |
| Robineau, Jacques | France (Ballons Montés) | Paris 1949, 1913–91, dealer, AIEP 1970–91 |
| Rocha, Carlos Hernández | Uruguay | Federación Urugaya de Filatelia |
| Rockling, Dr. S. (Romeko) | Russia, Ukraine, Hungary | See Romeko |
| Rodehuser, F. H. | German occ. Kurland | Dealer? Seen on probably genuine. |
| Rodendorf, Karl (Cyrillic 'KP') | Ukraine | Moscow, a forger, always on his forged |
| Rodewald, Adolf ('A.R.') | Germany East (1945 locals Grabow) | . |
| Rohr (two, one in script) | Germany, German Colonies, French PO Levant | . |
| Roig, A., Barcelona,
2 (Catalan: Antoni Roig) | Spain, Europe, Worldwide. Seen on forged eg. Cracow 1919 and Japanese stamps | Dr. Antonio Roig Soler, Barcelona 1943, 1881–1970, dealer, AIEP 1954–70, his mark 2 has been forged. Note |
| Roig, Ramón | Spain, Russia, France | COMEX 1996 |
| Romeko Paris. Certif. | Russia (areas), Ukraine, Hungary (on forged ovpt) | Dr. Serge Rockling (Rochlin, Rocklin), Paris, 1893–1975, dealer t.a. Maison Romeko 1921–c.65, AIEP 1968–75 |
| Rommel, Dr. O. | German States (Bergedorf, Lubeck), Peru | Leipzig 1897 |
| Rommerskirchen, Dr. Helmut | Croatia; German occ.s Albania, Channel Is. and Soviet Union | Krefeld, BPP 1968 |
| Roosevelt, Franklin D. | USA | Item that belonged to President R. |
| Roots, Jaan | Estonia | Oslo 2004, EFL 2004–. Note |
| Rosauer, L. | Portugal | . |
| Rose, Hans | Germany (Wohnungsbau) | Kitzingen, BPP 1968 |
| Rosen, Bill | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Rosenberg, Ad. | Heligoland | Frankfurt 1897 |
| Rosenberg Jr., B. | Rumania | Bucarest 1897 |
| Rosende, Dr. Alberto | Cuba | . |
| Rosende, Dr. Roberto | Cuba | Yonkers NY, b. 1935, AIEP 1981–2002 |
| Rosenius, Dr. Carl | Finland (pre-1875) | Helsinki 1961 |
| Rosenkrantz, Albin | German States (Schleswig-Holstein) | Kiel, 1851–1913 |
| Rosselevitch, Anatoly ('Ross, 2') | Armenia, Azerbaijan, Georgia, Russia (areas) | Brussels 1949, later USA, d. c. 1980, dealer |
| Roth, Douglas | Cape of Good Hope | Newlands (South Africa), 1906–90, AIEP 1970–80 |
| Rothe | Costa Rica | . |
| Roumet, Alexandre. Certif. | France and Colonies | Paris 2002, cf. below |
| Roumet Exp., 2 (Roumet in circle) | France and Colonies | Alexandre and Philippe R., Paris 2000, dealers f. 1896 by Octave R. |
| Roumet, Octave | France and Colonies, Worldwide | Paris 1926, dealer |
| Roumet, Philippe | France and Colonies | Paris, b. 1921, dealer (Maison Roumet), AIEP 1954–c.56 |
| Roussos | Greece | . |
| Rowell, Colonel Milo D. ('MDR') | Japanese occ. Malaya | Great Britain, d. early 1990s |
| RP | Germany | See Pyznar |
| RPS, RPSL Certif1, 2, 1917. Note | Br. Colonies, Worldwide | Royal Philatelic Society London, expert comm. 1894–, [FFE2 p.173; Brühl p.482, PE] |
| RPSNZ | New Zealand, Br. Pacific Is. | Royal Philatelic Society of New Zealand, exp. comm. f. 1952, [PE] |
| RPS of Victoria. Certif. | Australia, New Zealand, Br. Pacific Is. | Royal Philatelic Society of Victoria, exp. comm. f. 1949, [PE]. Note |
| RS (in circle) | Ukraine | See SR |
| Rucins, A. G. (Arvid G.). Rucins | Estonia, Latvia | Latvia?, active c. 1950–70 |
| Rudminski Odessa | Ukraine | Odesa, dealer |
| Rudolph, Hans | Finland (incl. Aunus etc.) | Cossebaude (Germany), BPP 1991 |
| Ruggiero, Michael Eugene (Works as member of committee.) | Japan, Korea | Staten Island NY, b. 1928, expert 1974–, AIEP 2002–, ISJP, [FFE6, PE] |
| Rühland, Gustav (Ruehland) | German States (Brunswick 1864) | Braunschweig, 1859–1932 |
| Ruidiaz (Beremundo Ruidiaz Alfonso) | Central America | Mexico DF 1949, dealer, forged |
| Ruiz, Alfonso | Spain | Madrid pre-WW2, dealer's advert. |
| Rummel, Wilhelm | German States (Bremen), German occ. Rumania | Bremen 1935 1950, 1885–1959 |
| Rungas, Wolf | Germany (field post Mi 1–4, Inselpost) | Munich, d. 1981, BPP 1961 |
| Rupp, Bruno | Switzerland | Liechtenstein, b. 1912, SBPV (now retired), AIEP 1970–74 |
| Rusu-Arad | Rumania (Regatul) | On genuine, [Flasch] |
| Ruthphil | Ukraine | Dealers? |
| Rutkowski (also in script) | Ukraine | Ukraine, later Bulgaria, collector, main distributor of the so-called Kherson local |
| Ryblewski, Jan | Poland | Kraków 2000, b. 1919, Polish Fed., AIEP 1972–2002 |
| S (in blue): genuine overprint | Belgium and Colonies | See Soeteman, additional marks |
| S. S:berg | Finland | See Strandberg |
| SA | USA | See Anderson, Spencer |
| SA (monogram, actually AS) | Ukraine | See Stohmann |
| Saatchi, Joe ('ST') | Br. occ. Baghdad, Bushire | England, expert 1950s–1980s |
| Sabban Cohen, Albert | France | See Cohen Sabban, Albert |
| ablatúra, Svätopluk (Sablatura) | Czechoslovakia, Bohemia & Moravia, Slovakia, Carpatho-Ukraine (Chust 1944) | Bratislava, b. 1929, SCF 2001 |
| Sabler ('rs') | . | Pre-WW2 |
| Sachse, Dr. Paul ('Dr. Ps.') | Germany, etc. | Germany, dealer or collector |
| Sadowski, Prof. | Ukraine | . |
| Sadri, Mehrdad (or manuscript 'MS'). Certif. Homepage | Iran (Persia), Middle East | Glendora CA (USA) 2001, b. 1952, expert 1979–. Note |
| Saeftel, Dr. Henning | Spain (excl. ovpt 1868–69 & locals) | Henstedt-Ulzburg, BPP 1980 |
| Sahlstedt, Bror-Erik | Estonia | Helsinki, 1918–2004, Finn. Phil. Fed. 1981–94 |
| Saidla, Uno (*U.S.*) | Estonia | Tallinn, expert c. 1960–95 |
| Salisbury, Steven | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Salmenkylä, Anton. Certif. Photo | Finland (esp. 1975–82) | Helsinki 1961 1974, b. 1910 |
| Salomon, Paul (forged, forged) | Germany (Bizone Bauten, Notopfer, Wohnungsbau, BRD) | Passau 1975, BPP 1961 |
| Salvatteci, Aldo | Peru | Peru, b. 1950, AIEP 2003–, [FFE7, PE] |
| Salz, Richard H. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| San Giusto, Filatelia. Certif. | Italy, Trieste | Trieste 1956 2002, dealers. Note |
| Sanabria. Inc. N.Y., 2 | Worldwide (air mails) | Nicolas Sanabria Inc, New York NY. Note |
| Sanchez, Heitor ('Heitor S. Paulo') | Brazil | Sao Paulo 1918 1943 1965, dealer |
| Sancin, Danilo. Certif. Note | Italy, Trieste | Trieste 1956, expert. Cf. San Giusto. |
| Sanders, Warren H. | Confederate States | USA 2000 |
| Sandfield, Byron | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Sanhotz Paris (or San Hotz) | Cape of Good Hope, Worldwide? | Dealer? |
| Sanko ('reference') | Japan (on forged) | See Japan |
| Saraceni, Gioacchino | Albania | [Mi 1935] |
| Sarafian, K. | Saudi Arabia (Hejaz) | On forged [APAI] |
| Sassone, Dr. Luigi | Italy (CLN Aosta issue) | Milan 1943, dealer |
| Sauer, Erich | Germany (field post Kuban & Krim) | Siegen, BPP 1984 |
| Savarese Oliva, Bruno. Certif. | Italy | Genoa 2001, dealer. Note |
| Savini, A. | Worldwide (Zeppelin) | . |
| SB (in purple in SE corner) | Germany (1948 currency reform ovpt) | Seen on genuine stamps |
| Sberate | Czechoslovakia | Sbęratel means "collector" in Czech |
| SBPV (in French: ASEP). Certif. | Switzerland, Liechtenstein | Schweizerischer Briefmarkenprüfer-Verband (The Swiss Federation of Phil. Experts), [PE]. Note |
| SCF | Czechoslovakia etc. | Svazu Českých Filatelistů, Komise Expertu f. 1960. Encountered irregularities in Dec. 2003, but was reorganised. [PE] |
| Schäfer, Dr. | Mexico | Meissen 1897 |
| Schenek, Major Alfred | Iran (Persia), Japan, Montenegro, Serbia | Graz 1897 |
| Schenk, G(eorg) | German Colonies, Hungary | On genuine, [Flasch] |
| Schirnhorn (in scrip) | Ukraine | Captain, German Army, Ukraine WW1 |
| Schlegel BPP (forged), 2 (forged) | Germany (Mi 338–970, Official Mi 99–177, Berlin, Bizone excl. Bauten, French Zone, BRD) | Hans-Georg Schlegel, Berlin, b. 1922, dealer, BPP 1976, AIEP 1974 |
| Schlegel, Andreas (forged) | Germany (Allied occ. Mi 911–970, Bizone and BRD), German occ. Libau | Berlin, BPP 1991 |
| Schlegel, Hans-Dieter | Germany (Mi 338–910, Official Mi 99–177) | Berlin, BPP 1991 |
| Schlenger, Karl-Wilhelm | Yugoslavia (1929–); German occ.s of Ljubljana, Montenegro and Serbia; Italian occ. Ljubljana | Krefeld, d. 1987, BPP 1980 |
| Schlesinger, Julius ('J.SCHL', 2). Note. Unidentified Schlesinger | Worldwide | Berlin, 1858–1920, dealer, considered not fully reliable, [Brühl, Tyler]. Advert. |
| Schloss, J. H. | German States (Thurn & Taxis) | Frankfurt a.M. 1897 |
| Schlosser, Karl | Saar | Saarbrücken 1949. Note |
| Schmidl, Horst K. | Germany (stamp booklets) | Gröbenzell, BPP 1984 |
| Schmidt | Ukraine | Germany, engineer, [UPNS] |
| Schmidt, H. (Karl Heinz?) | Germany East (Bezirk 1948) | Stade, BPP 1961 |
| Schmidt, W. | German States (Wurttemberg), USA | Hattenheim (D) 1897 |
| Schmitt, Joh. Ulrich | German States (Bavaria), Crete, French and Italian PO Crete, Samos, Ikaria, Albania (Korce), Epirus, Greek occ. issues | Diessen a.A. 2003, Munich, b. 1936, expert 1965–, BPP 1968, AIEP 1982–, [FFE5, PE] |
| Schmolzer ? | Turkey | . |
| Schmutz, Leslaw, 2 | Poland, Memel, German occ. Poland | Rzeszów 2000, Polish Fed. |
| Schneider | Ukraine | Dealer, [UPNS] |
| Schneider, Albert M. | France (postal history) | Paris, b. 1945, dealer, expert 1972–, AIEP 1988–, [FFE4, PE] |
| Schneider, H. | Egypt | Pforzheim 1897 |
| Schneider, R. | . | VÖB a.o. member |
| Scholl | Germany (1945 locals) | . |
| Schollmeyer, Dr. Wolfgang | France, French Colonies (general issues) | Leipzig, 1931–98, BPP 1991 |
| Schönherr, Heinz-Jörg | Germany East (Mi 212–41, DDR) | Leipzig, b. 1944, BPP 1996 |
| Schřnning, Hans (Schonning) | Denmark | Ĺrhus 1979, prev. dealer (AFA) |
| Schöpfer, Klaus (Schopfer, Schoepfer) | Austria and Bosnia & Herzegovina (postal history) | Innsbruck, b. 1948, expert 1993–, AIEP 1998–, VÖB, [FFE3, PE] |
| Schöyen, Björn A. (Schoyen) | Norway (local posts) | Norway, b. 1962, expert, [FFE4] |
| Schramtschenko | Ukraine | See Shramchenko |
| Schredinsky Paris (or Sredinski) | Russia (South Russia, Wrangel) | See Sredinsky |
| Schreuders, Dr. F. | Belgium, Netherlands Indies, Orange Free State, Stellaland, Swaziland, Transvaal | The Hague 1897 |
| Schröder, Dr. Arthur (boxed) (+forged), also Schroeder | Estonia (excl. locals), Yugoslavia (pre-1941), Latvia, Hungary, Czechoslovakia, Rumania (Mi 36–), Netherlands (ovpt stamps only) | Lippstadt/W. 1950, Mülheim/Ruhr, 1895– 1968, BPP 1958–, AIEP 1954–68, mark in use c. 1930–60 |
| Schröder, Johannes (Schroder) | Germany (excl. Infla) | Geschendorf 1950, Lubeck, BPP 1961 |
| Schubert | Saar | . |
| Schuhardt, Hans | Heligoland | Germany (East) 1980 |
| Schüler, Gerhard (Schuler) | Danzig | Hamburg, 1911–81, BPP 1961 |
| Schull, Lew | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Schulmann | Ukraine | . |
| Schultz-Steinheil, Herman | Sweden | Stockholm 1961, 1895–1976 |
| Schulz, Karl-Heinz | Heligoland | Norderstedt, b. 1946, BPP 1996 –2004 |
| Schulz, Oscar | German States (Mecklenburg-Strelitz), Mexico (pre-1900) | Hamburg, BPP 1961 |
| Schulze, Adolf | Switzerland | Zurich, 1841–1892 |
| Schulze, Hermann | Germany (Mi 115, 118) | Berlin, BPP 1961 |
| Schulze, W. | German States (Lubeck) | Germany, pre-WW2 |
| Schulze-Dirks, Dr. Arno Alex. | Germany East (OPD Prov. Sachsen) | Halle 1948 |
| Schuman, Stephen D. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Schuman, William O. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Schumann, Alexander | China | Shanghai, 1930s 40s, dealer, cat. editor |
| Schumann, Otto A. | Chile, Nicaragua | Berlin-Wilmersdorf 1935, b. 1884 |
| Schupp, Wilhelm | Saar | Sulzbach (Saar) 1949. Note |
| Schwarz, Ludwig | Rumania (Moldavia), Austria (Merkur) | Vienna, 1843–1912, [Brühl p.484] |
| Schweizer, Michael | German occ. Poland (GG) | Köngen, BPP 2004– |
| Schwendimann, Fred. | Switzerland, Europe (old) | St. Gallen 1949, official expert 1949 |
| Schwenson, Cyril | Finland (incl. Aunus, Karelia, North Ingermanland) | Bad Bevensen, BPP 2000 |
| Schwindt, Holger ('HSdt' monogram) | Finland, Worldwide | Helsinki, 1899–1955, FFF exp. comm. 1932– |
| Scott Stamp & Coin Co ('SS&CCo') | Worldwide | New York, early 20th century, dealers |
| SDT (in manuscript) | Armenia | See Tchilinghirian |
| Sebastian, Fritz | German States (NDP) | Hannover 1950, BPP 1961 |
| Sedlak, Ernst | Czechoslovakia | Frantiskovy Lazne (CZ), 1920s. |
| See, Franz von | . | Austria, 1898–1977, AIEP 1967–77 |
| Seefeldner, Gustav, Prof. GS + heron, 'SG' (in circle) | Austria, Cape of Good Hope, Gabon, Greece, Hungary, Italian States, Iran (Persia); Ukraine (owner's mark) | Salzburg 1896, Vienna pre-1950, UPV, [Wilhelm van Loo] |
| Seeger, Wolfram | German States (Baden) | Kassel, 1911–83, BPP 1976, AIEP 1975–83 |
| Séfi, Alexander J. (Sefi) | India (Kashmir), Worldwide | London 1926, 1889–1934, dealer, STPA expert. BPT WhoWasWho |
| Seichter, Dr. Rudolf, 2 & supplemental marks (1 & 2: c.1947–60), 3 (c.1960–) | Ukraine | Soltau/Hannover 1950, 1889–1977, BPP 1958–, AIEP 1956–74; mark forged, [UPNS] |
| Seitz, Anton | Austria, Lombardy-Venetia, Bosnia & Herzegovina | Vienna 1949, 1900–67, dealer, BPP 1961, AIEP 1954–67 |
| Sékula, Béla | Europe | See Székula |
| Seligson | Finland | Turku?, dealer, in use 1930s |
| Sellschopp, (Wilhelm?) | Germany (Germania issues), etc. | Probably dealer W. S., Hamburg, f. 1891 |
| Sem, Peter | German States (Thurn & Taxis, Bavaria –1875) | Gundelsheim, b. 1950, BPP 1991 |
| Sempere, José M. | Spain | Barcelona, b. 1947, dealer, expert 1983–, COMEX 1996, AIEP 1998–, [FFE3, PE] |
| Senabre, (Ricardo?) | Spain (Carlist issues) | Spain |
| Senf Leipzig, Gebr., 2. Note. Advert. | Worldwide | Dealers f. 1881, Leipzig, [Tyler] |
| Serebrakian, Souren David, 'SER' (in rectangle). S. Serebrakian Inc. | Carpatho-Ukraine, Ukraine, Armenia, Azerbaijan, Georgia | Monroe NY, in Brussels (1931 1949), 1900–91, dealer, also on forged. Note |
| Serrane, Fernand | Europe, Worldwide | Nice 1926, 1860–1932, famous expert |
| Sesö, Sten | Sweden (Värnamo issue only) | Värnamo, reliable certificates |
| SF | Greece, Epirus | See Spetsiotis Frčres |
| SF + inverted, 2 (in square). Note, 2 | Finland (esp. Aunus) | Suomen Filatelistiseura, Helsinki, in use 1922–40s |
| SFA (in Russian, C Ř A) | Russia, Soviet Union | See Soviet Philatelic Association |
| SG | Worldwide | See Gibbons Ltd, Stanley |
| SG (not in oval) | Hungary | See Sipos |
| SG in circle | Ukraine | See Seefeldner |
| SG Philatelique | Ukraine | Also on forged |
| Sharp, Frank | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Shchapov, Peter, 'P.S.' | Ukraine | Moscow c. 1920, dealer, speculator |
| Sheryer, Richard | Canada, BNA | Mississauga ONT, b. 1951, dealer, expert 1980–, AIEP 1995–, [FFE3, PE] |
| Shoemaker, J. Randall | USA, BNA, Br. Colonies | Dealer, Profess. Stamp Experts 1987– |
| Shramchenko, Capt. Svyatoslav de | Ukraine | Poland, USA, also on forged. Note |
| Shredinsky (or Shredinski) | Russia (South Russia, Wrangel) | See Sredinsky |
| Schroedter, Victor | France | Paris 1897 |
| Sibiescu (or Sibiesco) | Rumania | The Nice 1943 dealer? |
| Siebentritt, Reinhold | German East Africa | Gunzenhausen, BPP 1984 |
| Sieger, H. E. | Worldwide (air mails) | Hermann Ernst Sieger, 1902–54, dealers f. 1922, AIEP 1954 |
| Sieger, Hermann W(alter) | Worldwide (air mails), Germany (air mails, Zeppelin), German States (Württemberg), German occ. Poland (GG), Andorra, Liechtenstein | Lorch/Württ. 1950 2003, b. 1928, dealers (Hermann E. Sieger f. 1922), expert 1955–, BPP 1961, AIEP 1956–, [FFE4, PE] |
| Siewert, John | Russia | Moscow 1897 |
| Sigerist-Moser, E. | Switzerland | Schaffhausen 1897 |
| Silombra, Jean | Worldwide (air mails) | Paris 1961, 1915–98, AIEP 1954–98 |
| Simmermacher, René | Greece (Mi 1–157) and PO abroad, Ionian Is. (1859), Serbian PO Kerkyra | Staufen/Brsg. 2003, Freiburg, BPP 1968 |
| Simoes Ferreira | Portugal | See Ferreira |
| Simon, Dr. Joachim, 2 | Germany (air mails, Mi I–IV) | Zwickau, b. 1927, BPP 1991 |
| Simon, Siegfried | German States (Baden) | Karlsruhe 1935, Newark NJ 1950, b. 1895 |
| Sinais, Bertrand | France (postal history) | Paris, b. 1953, dealer, expert 1984–, AIEP 1992–, [FFE3] |
| Singhee, A(jeet). R. | India | Hyderabad, Philatelic Congress of India president and expert 2001 |
| Sipos, Géza ('S.G.' not in oval) | Rumania/Hungary (Székelyudv. ovpt 1944) | Székelyudvarhely (Odorhieu), [Flasch 40] |
| Sipos, Zsuzsa | Hungary (pre-1900) | Budapest, 1942–2003, expert 1976–2003, AIEP 1991–2003, [FFE3] |
| Sips, Zoran | Bosnia & Herzegovina, Yugoslavia (SHS) | Zagreb, CPS 2000– |
| Sismondo, Sergio. Certif. Note | Canada, BNA, Cape of Good Hope | Syracuse NY, b. 1943, dealer, expert 1993–, AIEP 1999–, [FFE3, PE] |
| Sjöman, Per (Sjoman) | Sweden | Gothenburg, b. 1905, also on forged. Note |
| Sk., H. | Danish West Indies | . |
| kaloud, Jirí (Skaloud) | Czechoslovakia (Hradcin issue) | Brno, SCF 2001 |
| Skandera, Bohumil ('bsb') | Czechoslovakia | Brno 1949, 1896–1978, dealer –1952. Note |
| Skweir, J. Michael, also 'CKBIP' | Ukraine | USA, collector, UPNS member |
| Sloane, George B. | USA | New York NY 1926, 1898–1958, dealer |
| Slovenský Filatelista | Czechoslovakia | Bratislava, f. 1939–, experts: Novotny, Ptacovsky, Kozak, Milos Müller |
| SM | Europe | See Mantow |
| SMI | Germany (Marienwerder) | On forged |
| Smith, Jay. Certif. Homepage | Scandinavia | NC USA, dealer, expert under own name 2003–, APS expert |
| Smith, Peter A. S. (Works as member of committee.) | Egypt, Sudan | Ann Arbor Mich b. 1920, APS expert 1975–, AIEP 2000–, [FFE3 4 6, PE] |
| Smyrloglou | Greece | Greece |
| Soc Mis – Marque Garantie | Hungary | See Marque Garantie... |
| Soecknick, Rüdiger | Danzig, Austria, Bosnia & Herzegovina | Klosterneuburg, BPP 2003 |
| Soeteman, Corneille ('CS', 'Corneille'), additional marks. Certif. | Belgium and Colonies | Brussels 1999, expert committee 1966–, [Soeteman]. Note |
| Sohn, Emil | Worldwide (rarities) | Frankfurt 1897 |
| Solari, Ing. Alberto | Argentina (Buenos Aires, Corrientes) | Buenos Aires. Note |
| Solens, Jack | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Soler Antich, Josep (José) (Works as member of committee.) | Spain and Colonies | Barcelona, b. 1952, dealer, expert 1989–, COMEX 1996, AIEP 1998–, [FFE3, PE] |
| Sommer, Dr. Erwin | Germany and States (Thurn & Taxis among others), Heligoland | Braunwald (Switzerland), 1912–91, BPP 1958–, AIEP 1978–91, forged, on forged |
| Sommer, Martin-W. (forged) | Germany (Mi 1–30) | Weilburg, BPP 1991 |
| Sommer, Dr. Paul (E.) | Heligoland | Limburg 1950 1961, d. 1963, AIEP 1956–63 |
| Sorani, Silvano. Certif. | Italy (Mi 1–641), Italian States, PO abroad, Colonies and occ.s, San Marino, Trieste A, Vatican | Milan, b. 1934, BPP 1996 |
| Sormul | . | Norway? Estonia? |
| Soro Bergua, Enrique, 'En Soro' | Spain and Colonies | Barcelona, b. 1934, expert 1970–, AIEP 1980–, [FFE2 3 6, PE] |
| Soviet Philatelic Association ('S Ph A USSR', 2, 3?). Unidentified. Note | Russia and areas, Soviet Union | Moscow. In Russian 'C Ř A' = S F A |
| SP (in circle) | Russia (Siberia) | See Pappadopulo [RJC] |
| SP. Garan. (in triangle) | Turkey | . |
| SPA. Certif. | USA, Worldwide | USA 1976, Society of Philatelic Americans, expert committee, (cf. Torrey) |
| Spalink, Friedrich | German States (NDP and Alsace-Lorraine) | Freiburg, b. 1919, BPP 1976 |
| Spanos, D. | Greece | Athens 1949, dealer |
| Sperati Reproduction | Worldwide | Stamped by BPA on Sperati forgeries |
| Spetsiotis Frčres (brothers) ('SF') | Greece, Epirus | Athens, dealers, on forged & reprinted |
| SPhA USSR | Russia, Soviet Union, and areas | See Soviet Philatelic Association |
| Spillner, K. | Germany | . |
| sprucetree (green; picture of) | Lombardy-Venetia, Austria | See Provera. Note |
| SR (or RS) (in circle) | Ukraine | . |
| rámek, Frantiek (Sramek) | Czechoslovakia | Prague, 1923–99, SCF |
| Sredinsky Paris (or Schr...) also T Hals S.O. Paris and Hals? | Russia (South Russia, Wrangel Army) | Alexandre S., Paris, pre-WW2, dealer, considered to be a forger. Note |
| SS (in blue): genuine double ovpt. | Belgium and Colonies | See Soeteman, additional marks |
| SS&CCo | Worldwide | See Scott |
| SS:berg | Finland | See Strandberg |
| St | Germany (locals and OPDs 1945–6) | See Sturm |
| ST | Br. occ. Baghdad, Bushire | See Saatchi |
| St. b., E. ('E. St. b.') | Russia (areas) | Also on forged |
| Stach, Alfons, 2 | German States (Bavaria), Czechoslovakia | Prague, New York NY 1939, dealer |
| Städele (Stadele) | Switzerland | . |
| Stahel, Oskar | Worldwide (air mails) | Zurich 1949, official expert 1949 |
| Staiger, F. | Austria (1945) | . |
| Stallberg, Hermann | Poland | Wermelskirchen 1944, dealer |
| Stanek | Czechoslovakia | Czechoslovakia, owner's mark? |
| Stanley Gibbons Ltd | Worldwide | See Gibbons Ltd, Stanley |
| Starauschek, Friedrich (expert of Heinrich Köhler) | Germany, German States and Colonies, Europe (pre-1900), Worldwide (pre-1900) | Berlin-Tempelhof & Wiesbaden 1950, Berlin-Charlottenburg 1961, BPP 1961 |
| Steczynsk, M. E. | Poland | Chicago 1950 |
| Stegmüller, Franz (Stegmuller) | German States (Baden, Bavaria 1849–75, Oldenburg) | Vaterstetten, BPP 2001 |
| Steiden, Georg von | Carpatho-Ukraine | Munich 2001, UPNS expert |
| Stein, Leo - Wien I | Russia, Western Ukraine etc. | Vienna, dealer, forged [Bulat] |
| Steiner, Dr. Laszlo | Hungary (also on forged) | Budapest, 1906–93, AIEP 1967–93, [Flasch] |
| Steinway, Theodore E. | Worldwide (pre-1940) | New York NY, 1883–1957, chairman PF |
| Stella - Odessa | Ukraine | Odesa, dealers, [UPNS] |
| Stemien, Martin F. | France | New York NY 2001 |
| Stemmler, Winfried | Germany (Bauten Mi 73–100) | Korntal-Münchingen, BPP 2003 |
| Stempel falsch | German area (mainly) | German for "Forged postmark" |
| Stenger, Prof. Dr. Erich | German States (Bavaria) | Berlin-Charlottenburg, 1878–1957 |
| Stepanow | Russia (Wenden) | Early 1900s, also on forged |
| Sternwald, Frantisek | Austria | Czechoslovakia, d. 1984, expert 1961– |
| Steuer, Dr. Friedrich F., 2 | German PO abroad (Vorläufer), German PO Levant, German SW Africa | Vienna, d. 1997, BPP 1991 |
| Steuer, Ronald F. Certif. | German Colonies and PO abroad | Vienna 2001, VÖB, BPP 2003, son of Friedrich Steuer |
| Steyrer, Christine | Austria | Vienna 2001, catalogue, VÖB member |
| Stich, Prof. Karl | Austria (1945 locals) | VÖB member 2004 |
| Stiedl, Otto E. | Estonia, Fiume | Vienna 1935 |
| Stilwell, George | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Stock, Ernst | German States, Worldwide | Berlin, dealer 1889–1931 |
| Stodola | Czechoslovakia | Czechoslovakia |
| Stoebe, Roman | Germany (1918) | Berlin-Köpenick 1950, b. 1883 |
| Stohmann, André; 'Stohm.', 'AS' (device stolen) | Liechtenstein, Ukraine | Vienna, Berlin 1929 as dealer, VÖB 1935 1950, UPV |
| Stolof (!) | Russia (areas) | On forged |
| Stolow, J. H., 2, Stolow. Certif. Berlin-Charltbg.: F. S. R. Stolow | Worldwide | New York (Julius & Henry S., 1930s to 1970s), Berlin, Munich (Henry Stolow); also on forged. Note |
| stork (picture of) | Iran (Persia) | . |
| Stötzer, W. | Great Britain and Colonies | Berlin 1897 |
| Stoupa, F. | Czechoslovakia | Prague, pre-WW2, dealer |
| Stout, Douglas W. | Mexico | MEPSI expert committee, q.v. |
| Strachwitz, Graf (Count Otto von S.) | Heligoland, Italy, etc. | Berlin 1943, dealer (t.a. Philat. Cabinet) |
| Strandberg, Selim ('S. S:berg') | Finland | Turku, 1889–1942, dealer, in use 1930s |
| Strandell, Nils | Scandinavia, Bosnia & Herzegovina, Montenegro, Ukraine | Stockholm 1926 1961, 1876–1963. Note |
| Straub, Wolfgang | Germany (French Zone) | Schöneck, b. 1947, BPP 1996 |
| Strauch, Jenö | Hungary, Rumania (Regatul) | Budapest, dealer, [Flasch] |
| Ströh, Bodo (Stroh, Stroeh) (forged) | Germany (certain locals and OPDs 1945) | Henstedt-Ulzburg, BPP 1980 |
| STS | Russia (South Russia Kuban Govt) | . |
| Stuckert Düsseldorff | Germany (1918), Worldwide | Anton S., Düsseldorf-Oberkassel 1943 1950, dealer (firm still existing) |
| Stupka, Jiri | Czechoslovakia (typo stamps) | Czech Rep., b. 1949, SCF expert 2004– |
| Sturm, A. | Ukraine | Tallinn, dealer, 1910s 20s, [UPNS] |
| Sturm, Heinz Egon (forged), 'St' | Germany (1945–6 locals and OPDs) | Detmold 1968, BPP 1961 |
| Sturzeis, Fritz | Austria (1945 postal history) | Vienna 2001, VÖB |
| Subocz, Bohdan | Poland | Warsaw 2000, Polish Fed. |
| Subotica, Philatelica | Hungary | See Philatelica Subotica |
| Suchánek, Hugo (H.S.P. in triangle) | Czechoslovakia | Prague (Husova Street), dealer |
| ula, Jaroslav (A and crown) | Czechoslovakia (Posta 1919) | Prague, 1865–1927, [Flasch] |
| Sundgaard, R. | Denmark | Denmark |
| Sundman, Christian | Finland (first issue) | Espoo, 1933–94, Finn. Phil. Fed. 1981–94 |
| Sundman, Jacobus. Photo | Finland (local posts) | Helsinki, b. 1916, Finn. Phil. Fed. 1981– |
| Sutcliffe, V. | Poland (Cracow 1919) | Also on forged |
| Suzuki, Yasushi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| SV (in circle) | Ukraine | See Svenson, Constantin |
| Svendsen, Lars. Certif. | Iceland, Denmark | Virum 1989 2004 |
| Svenson (in Gothic), 'SV' (in circle) | Ukraine | Constantin Svenson, Wiesbaden, b. 1871 in Kyev, was in Ukraine c. 1920 |
| Svensson, Nils. Certif. | Sweden | Stockholm, deceased |
| Sveriges Filatelist Förening | Sweden | Stockholm, society f. 1886 |
| Svoboda, Gerhard | Austria (local issues) | Vienna 2001, VÖB |
| Swendsen, W. | Russia (Wenden) | Riga 1897 |
| Synek, Dr. Bohumil | Slovakia | Bratislava, b. 1956, SCF 2001 |
| Sz (manuscript, in circle) | Hungary (Szeged, Debrecen I) | See Székely |
| Sz, Dr. | Hungary | See Szalay |
| Sz., Dr. P. | Hungary | See Szilágyi, Paul |
| Szabó | Hungary (Debrecen) | On genuine, [Flasch] |
| Szalay, Dr. Béla (=Adalbert) ('Dr. Sz.'). Note (forged) | Rumania (Regatul), Hungary (Debrecen) | Sibiu (Hermannstadt) 1935, b. 1869, the foremost expert on these issues, [Flasch] |
| Szav. (Hungarian for 'guaranteed') | Hungary (Debrecen) | On genuine, [Flasch] |
| Székely, Mór ('Sz' in circle) | Hungary (Szeged, Debrecen I) | C. 1920, forged, [Flasch 149] |
| Székely Bpest (in two lines) (Szekely) | Hungary (occ. ovpt.s) | Sándor Székely, Budapest 1949, dealer, [Flasch] |
| Székula, Béla - Luzern (Sekula, Szekula) | Europe, Hungary, Bolivia (1894), Ethiopia (1919), etc. | 3 brothers, Bela Sz. b. 1881, dealers pre-WW2, forgers, [Flasch 153, Tyler] |
| Szilágyi, Bela (Szilagyi) | Hungary | Miskolc, Budapest 1949, dealer, [Flasch] |
| Szilágyi, Dr. Paul J. ('Dr. P. Sz.') | Hungary | USA 1998, collector, [Flasch] |
| SZO | Hungary | [Flasch] |
| Sztaba, Kazimierz | Poland | Kraków 2000, Polish Fed. |
| T (in German type, twice on used) | Worldwide | See Thier |
| TA (in manuscript) | Br. Colonies | See Allen, T. |
| Tabata, Hiroshi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Tachikawa, Kenkichi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Taipale, A. | Poland | Finland? |
| Tarasoff, V. V. | Ukraine | Dealer |
| Tarján, Géza (Tarjan) | Hungary etc. | See 'Pape' |
| Tarre, F. del (Francisco del Tarré) | Spain | Barcelona, 1906–81, dealer, AIEP 1954–c.56 |
| Tarré, Jordi (Jorge) | Spain | COMEX 1996 |
| Tarré, Lluis | Spain | COMEX 1996 |
| Tatsopoulos, A. | Greece (WW2) | Greece? France? |
| Taubes | German States | . |
| Tausig Budapest, E. (Ede/Edmund Tausig). Note (forged) | Hungary (esp. Debrecen) | Budapest, well-known dealer, mark forged twice, [Flasch] |
| Tay, Peng Hian | Malaya (Straits Settlements pre-1900), Netherlands Indies (pre-1872), Burma | Singapore, b. 1944, expert 1989–, AIEP 1998–, [FFE4, PE] |
| Taylor, J. | Jordan (Transjordan) | . |
| Tchilinghirian, Simon D. ('SDT') | Armenia | Switzerland, 1902–67, AIEP 1959–63 |
| Teetsov, A., 2. (Anton Teetsov) | Estonia | Tallinn, dealer, in use c. 1920–30 |
| Tekel, Andrej | Czechoslovakia | Bratislava, SCF 2001 |
| Tekel, Josef | Slovakia (postal history) | Bratislava, 1954–2005, SCF 2001 |
| Tell, Jay | USA | Encino CA 2006, b. 1944, dealer 1965– |
| Terray | Hungary (Western Hungary) | Béla Terray?, Bratislava, dealer, [Flasch] |
| Teschke, K., Leipzig | Ukraine | Leipzig, dealer |
| Teuber, Wilhelm | Ukraine, Heligoland, Yugoslavia | Lehrte (Hannover) 1950, b. 1882, UPV |
| Thailand, Philatelists Association of | Thailand | Bangkok, expert committee |
| Thals Paris (T Hals) | Russia (South Russia, Wrangel) | See Sredinsky |
| Thiaude, Henri | France and Colonies | Paris 1943 1961, 1901–64, dealer, catalogue ed., AIEP 1954–64 |
| Thier, 2 (both in German type; 'T' twice on used stamps). Note | German States (Bavaria etc.), Turkey, Europe, Worldwide | Max Thier, Berlin-Charlottenburg, 1852–1925, renowned expert 1890–1920 |
| Thoden, Rudy J. ('RJT' in manuscript) | Saudi Arabia | Melbourne FL USA, d. 2002, Arabian Philatelic Association Int. |
| Thom, Einar | Germany (1945–6 locals and OPDs) | Meckelfeld, Seevetal, BPP 1968 |
| Thoma, Heinz (this hand stamp has gone astray; forged). Certif. | German States (Wurttemberg) | Winnenden, b. 1928, BPP 1968–98 |
| Thorand, Colonel J. | Rumania | Bucarest 1897 |
| Thorsson, Lars-Erik | Sweden | Sweden, expert 1970–80s |
| Thorsteinsson, Sigurdur H. | Iceland | Iceland, catalogue editor for 40 years |
| Thys, Herman | Belgium | Gent 2001, dealer. No longer 2005? |
| Tichatzky, Dr. Peter | Germany East (Mi 242–) | Berlin, b. 1929, BPP 1991 |
| Tigerstedt, Carl-Gustaf (manuscript) | Russia | Koria (Finland), b. 1886, an owner's mark? |
| Tili | Czechoslovakia | [P. Hoffmann] |
| Tillard, Jean-Jacques (JJT). Certif. | St. Pierre & Miquelon | St. Pierre, b. 1965, expert 2000–. Note |
| Tillhör H.F.F. | Finland, also Worldwide (forgeries) | Owners mark, see Helsingfors F... |
| Timroth, Georg von ('GvT') | Worldwide | Helsinki, 1887–1961 |
| Tiszolczy, Dezsö ('TyD') | Hungary (Western Hungary, Debrecen) | Debrecen, a collector, [Flasch] |
| Tkachuk, Jerry (Yaroslav) G. Note | Western Ukraine, Mariupol, Ukraine | Warren MI 2001, UPNS expert (chairman) |
| Tober, Hermann | Memel | Magdeburg 1935 |
| Tocher, Don | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Todd, Gregory C. G. | Dominican Rep., Mexico (1856–67), North Korea | Lymington GB, b. 1955, dealer, expert 1990–, AIEP 2002–, [FFE6, PE] |
| Tokar, Jerzy | Poland | Lodz 2000, Polish Fed. |
| Tokkos | Greece (Kavalla) | . |
| Tollu, Charles | France | Paris 1943. Note |
| Ton, Max | Italian States (Papal States), German States (Thurn & Taxis) | Weimar, 1882?–1951 |
| Tönjes | Sweden | Germany? |
| Torrey, Dr. Gordon H. | USA, Worldwide | Washington DC 1976, 1919–95, chairman, Expert Committee, Society of Philatelic Americans SPA |
| Toselli, Casimiro and Roberto | Italy | San Remo 2001. Note |
| Tóth Gy(ula) | Hungary | Debrecen, a collector's mark, [Flasch] |
| Toulieff, Serge | Belgium | Soumagne 2001, b. 1936, [Soeteman]. Note |
| Tournié, H(enry) | France, Europe | Paris 1943, dealer |
| Trabert, Dr. C. H. | Switzerland (Official excl. perf.) | Baden-Baden, BPP 1980 |
| Trachtenberg, B. ('B. Tracht. Odessa', 2) | Ukraine | Odesa c. 1920?, dealer, forged, also on forged |
| Trachtenberg, Henri | Worldwide (air mails) | Ivry-sur-Seine, 1908–87, AIEP 1964–87 |
| Trebitz, L. | Greece | Meerane 1897 |
| tree (green; picture of) | Lombardy-Venetia, Austria | See Provera. Note |
| Treschkow, P. von | Russia, Finland, Poland | Rüttenscheidt (D) 1897 |
| Tribuna | Czechoslovakia | Czechosl., pre-WW2, dealers, magazine |
| Tribuna Expert Committee | Czechoslovakia | See Chesloe, Charlie, USA |
| trident (image of) | Ukraine | See Peters, [UPNS] |
| Trioullier, Jean | . | France, AIEP 1960–74 |
| Tröndle, Alfred | Memel | Donaueschingen 1950 |
| Trouant | Austria | . |
| Trüssel, Kurt | Switzerland | Lucerne 2001, SBPV until c. 2002 |
| Tsachor, Yacov | Israel, Palestine | Tel Aviv, b. 1946, dealer, expert 1984–, AIEP 1993–, [FFE2 3, PE] |
| Tseriotis, Michael | Greece (Large Hermes) | Limassol, b. 1950, expert 1983–, AIEP 2000–, [FFE4 5, PE] |
| Tsuchiya, Masayoshi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Tubinovic, Dejan (T over a Cyrillic D) | Yugoslavia incl. SHS, Trieste B | Belgrade c. 1980, deceased |
| Tuori, Jussi | Finland (1856, 1860, 1866) | Espoo, b. 1940, Finn. Phil. Fed. 1999– |
| Turkly, London, F. B. | Ukraine (on forged) | See Turpin and Note |
| Turpin, F. B.*, F. B. Turpin London. *Note | Great Britain, Greece, Ukraine, (probably worldwide) | London e.g. 1910s, dealer, also on forged |
| Tust, Wolfgang | German occ. France | Sens (France) , BPP 1976 |
| Tworek, Rolf | Germany (Infla incl. Official) | Soest (D), b. 1943, BPP 1982– |
| TyD (in script) | Hungary (W. Hungary, Debrecen) | See Tiszolczy |
| Tyler, Varro E(ugene) | Japan, Korea | West Lafayette (Indiana), 1926–2001, expert 1965–, AIEP 2000–01, [FFE4 5] |
| Tzirac., D. | Greece (Large Hermes), Latin America | . |
| Udam, D. | German States | Netherlands |
| Uebersee Import GmbH Bremen | Nicaragua | Bremen. Some kind of advertisement. |
| UEM (in oval) | Russia (Siberia) | On forged |
| Uemura, Takahashi | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Uexküll, Jakob von, Jr. (Uexkull) | Worldwide (cinderellas), Saudi Arabia | London (2002), b. 1944, see R.L.A. |
| UJ, Dr (in circle) | Hungary | [Flasch] |
| Ukkan Asuncion Paraguay (3 lines) | Ukraine | Collector or society, [UPNS] |
| Ukr.-Phil. Verb. e.V. (used c.1937–60 by Teuber, Seichter), 2 (c.1920–60). Note on the UPV marks. | Ukraine | Ukraine-Philatelisten-Verband, a German association f. 1920, [UPNS] |
| Ukrainian Philatelic and Numismatic Society | Ukraine, W. Ukraine, Carpatho-Ukraine | See UPNS |
| UL | Hungary | A reliable mark, [Flasch] |
| Unger, Arthur | Turkey (Mi 86–) | Vienna, BPP 2008– |
| Union Royal Philatélique | Belgium | Brussels 1950 |
| Unterberg, Jenö | Hungary (Arad, Szeged) | Hungary, [Flasch 158] |
| Unverferth, Max | German States (Baden, Wurttemberg) | Pforzheim 1935, dealer, BPP 1958– |
| UPV | Ukraine | See Ukr.-Phil. Verb.; also on forged |
| UPNS. Certif. | Ukraine, W. Ukraine, Carpatho-Ukraine | Ukrainian Philatelic and Numismatic Society, Expertizing Committee, USA; cf. Tkachuk. Note |
| ürményi (cf. 'Ph.B.') (Urmenyi) | Rumania (Regatul) | Dr. Deszö Ürményi, Temésvar, [Flasch] |
| US (*U.S.*) | Estonia | See Saidla |
| UZ (similar to, in Armenian) | Armenia | Seen on genuine stamps w. forged ovpt |
| V (in blue): variety | Belgium and Colonies | See Soeteman, additional marks |
| Vaarnas, Kalle. Photo. (Certif.) | Finland (incl. Aunus), Austria, Belgium, Hungary | Helsinki, d. 1990, BPP 1961, Finn. Phil. Fed. 1981–90 |
| Väätäinen, Lauri | Finland (1975, comm. 1975–2001) | Kuopio, expert 2009–, Finn. Phil. Fed. 2009– |
| Vaccari, Paolo | Italian States (Modena, Parma, Toscana), Austria | Vignola (Italy) 2001, dealer |
| Vachat, Guy du. Certif. | Turkey | Villemomble (F) 2003, BPP 1996–2006 |
| Vaher, Eo | Estonia | Melville NY 2001, in use, forged. Note |
| Vajda, Dr. (manuscript, in use 1940–50) | Sweden, Estonia | Imre Vajda, Stockholm, 1893–1968, AIEP 1958–68, cf. Wennberg |
| Valic, R. | Yugoslavia (SHS) | [Flasch] |
| Valódi | Hungary | Hungarian for 'Genuine', [see Flasch 126] |
| van de Loo, Pieter F. A. VDLOOBDK | Netherlands and Colonies | See Loo, Pieter F. A. van de |
| van der Linden, James | Belgium | See Linden, James van der |
| van der Willigen, Adriaan M. A. | . | See Willigen, Adriaan M. A. van der |
| van der Vlist, Hendrik Willem | Netherlands (postal markings) | See Vlist, Hendrik Willem van der |
| van Mozian, ('VM') | Armenia, Azerbaijan, Georgia | See Mozian, van |
| Vanhorenbeck, Johan | Belgium | Antwerpen 1999, b. 1949, [Soeteman]. Note |
| var | Rumania (Regatul) | On genuine, [Flasch] |
| Varga, Ladislaus | . | Paris, 1897–1981, dealer (Y&T), AIEP 1954–81 |
| Vasdekis, N. | Greece | Greece, 1970s and 1980s |
| Vasquez-Cid, José | . | Spain, 1921–79, AIEP 1970–75 |
| Vassilyev, Konstantin, 'KV' | Russia | Collector |
| VDLOOBDK | Netherlands and Colonies | See Loo, Pieter F. A. van de |
| VDVLIST | Netherlands, France | See Vlist |
| VE (in circle, c.f. 'V.F.') | Yugoslavia | See Ercegovic |
| Velickovic, Prof. Dr. Jovan ('JV' in circle), 2. Note | Yugoslavia, Serbia, Bosnia & Herzegovina, Montenegro, Trieste B | Belgrade, b. 1927, expert 1975–, BPP 1991, AIEP 1994–, VÖB, [FFE2 3 5, PE] |
| Velten, Hans-Georg | Europe (Western; precancels) | Bad Kreuznach, 1906–93, BPP 1958–, AIEP 1954–80 |
| Verner, Jaroslav J. | Czechoslovakia (Legion in Siberia) | Bethesda MD (USA ), SCF 2001 |
| Verner, Mirko | Serbia, Montenegro, Bosnia, Yugoslavia, Hungary, Austria | Novi Sad 1954, 1915–82, AIEP 1958–80 |
| Verret | Belgium | Schoten (Belgium), dealer |
| Vervalsing | Netherlands | Dutch for 'Forgery' |
| Vervisch, Roger | Belgium | Brussels 2001, b. 1922, [Soeteman] |
| Vespermann, H(ans) Waldemar. Certif. | Italian States (Papal States), Vatican | Hamburg, BPP 1968 |
| VF (in circle, c.f. 'VE') | Yugoslavia | See Fleck |
| Vicini, Geom. Giovanni | San Marino, German occ. Ljubljana | San Marino 1950 |
| Vieira, Armando | Portugal and areas | Portugal (Porto?), d. 2004 |
| Vienot, J. | Germany (NDP: Alsace-Lorraine) | Mülhausen 1897 |
| Vieth, Günter | Germany (POL perforations) | Hamburg 1988, BPP 1976 |
| Vigor, Dr. | Armenia, Azerbaijan, Georgia | Also on forged |
| Vincent Graves Greene Philatelic Research Foundation | Canada, BNA | Toronto, expert committee, f. 1975, AIEP 1991–, [FFE2 4, APS Hall of Fame, PE]. Note |
| Vinc..., L. | Luxembourg | . |
| Vincke, Frhr. von | China incl. Shanghai and Formosa, Korea, Manchukuo, Mongolia, Tuva, Tibet | Wiesbaden, BPP 1958– |
| Viner, Dr. Charles William | Worldwide | London, 1813–1906 |
| Vinner, A. V. (boxed) | Soviet Union (RSFSR Postmaster Prov.) | Seen on genuine |
| Vinterstern, Prof. O. (in Russian) | Russia, Estonia | See Winterstern |
| Visnyovszki, Gábor | Hungary | Budapest, b. 1945, expert 1990–, AIEP 1991–, [FFE3 4, PE] |
| VK | South America | See Kneitschel |
| VK | Ukraine | See Kedrovsky |
| Vlastos, Orestis | Greece and all areas | Athens, 1920–96, dealer, AIEP 1991–96 |
| Vleeming, Henk | Netherlands | Enschede (NL), BPP 2003– |
| Vlist, Hendrik Willem van der | Netherlands and Netherlands Indies (postal markings) | Assendelft, b. 1936, expert 1970–, AIEP 1998–, [FFE1 3 4, PE] |
| VM | Armenia, Azerbaijan, Georgia | See Mozian |
| VÖB (VOB, VOEB) | Austria | Verband Österreichischer Briefmarkenprüfer (Austria), 1965–, [PE] |
| Vodrazka, Prof. Dr. Karl | Austria (DDSG) | Linz 2001, VÖB |
| Voetter, Otto | Austria (1850) | Lanzendorf 2004, VÖB |
| Vogel, Georg | Germany East (Meissen local) | Seen on stamps with forged postmark |
| Vogel, Jürgen | German States (Bavaria Mi 37–75) | Neufahrn, BPP 2001–05 |
| Volin, Herbert R. Note | Finland, Sweden | Calif. USA 2005, APS and PF expert |
| Vollmeier, Paolo | Italy (pre-adh.) | Castagnola (Switzerland), b. 1929, expert 1974–, AIEP 1979–, [FFE3, PE] |
| Volz, Gustav | Germany (field post Tunis) | Mainz, 1903/4–71, BPP 1958– |
| Vossen, Friedr. Karl (+forged) | Germany and States (incl. Währungs-reform), Italy, Europe (esp. ovpt.s) | Düsseldorf-Oberkassel 1950, 1912–84, BPP 1958–, AIEP 1954–75 |
| Votocek, Emil | Austria | Czechoslovakia, 1914–82, SCSF expert |
| Vyrovyj or 'W' | Ukraine | See Wyrowyj |
| W (in circle or without, also 'AW') | Hungary | See Walder |
| Wagner, Dr. Jan | Czechoslovakia | Czechosl., 1891–1968, USCF expert |
| Wagner, Matej | Czechoslovakia | Brno, 1876–1970, expert 1922– |
| Wagshal, Jerome S. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Wahl, Günter | Denmark, Danish WI, Faroes, Greenland, Iceland, Sweden (post-1900) | Dresden, b. 1929, BPP 1991 (no longer) |
| Wajda, Dr., 2, (manuscript) | Sweden, Estonia | See Vajda |
| wak | Saudi Arabia | See King |
| Walder, Arthur ('AW') (also 'W') | Hungary (ovpt), Rumania (Regatul) | Arad, five diff. marks, [Flasch 160] |
| Walisch, Stanislaw | Poland | Lodz 2000, Polish Fed. |
| Walker, Peter | Russia, Soviet Union | British Soc. of Russian Philately |
| Walli, Harry W. ('H.V.') | Finland (esp. North Ingerm.), Estonia, Latin America, Worldwide | Helsinki, 1900–1970 |
| Wallner, Dr. Ferdinand (forged), usually in handwriting. Photo | Greece, Albania (eagle ovpt 1913), Epirus, Croatia, Lombardy-Venetia, Austria, Poland (Cracow 1919), Czechoslovakia | Vienna 1943, 1894–1970, dealer, AIEP 1954–, VÖB, AIEP 1954–70, BPP 1961 |
| Walmath, Hennes (?) | Hungary (Baranya) | On genuine, [Flasch] |
| Walter | German States | . |
| Waris, Pentti | Finland (1889) | Jyväskylä, Finn. Phil. Fed. 1996–. |
| Wasenius, K. A. ('CW' in oval) | Finland | Helsinki, dealer, in use 1930s |
| Wasenius, Leonhard | Finland | Helsinki 1897 |
| Washburne, Stephen S. | Portugal and Colonies | USA, ISPP Portugal Society expert |
| Wassmann, Dieter | Russia, Soviet Union | Simmern, BPP 2003 |
| Watzke, Wolfgang | Latvia, German occ. Kurland, Ostland | Bonn, BPP 2000– |
| Watzlawick | Spain | Basel |
| Wayman, Giana | Costa Rica | San José 2001, Asoc. Filat. de C. R. 2001 |
| Ways, Marian Zbigniew | Poland | Torun 2000, Polish Fed. |
| Weber, Reinhard | Finland (fancy cancellations) | Järvenpää, b. 1943, Finn. Phil. Fed. 1990– |
| Weggler, Max | Switzerland (Int. Org.) | Zurich, dealer, BPP 1961 |
| Weid, Alain von der ('+Weid.' in manuscript). Certif. | Switzerland, France and Colonies | Geneva 2001, SBPV until c. 2002 |
| Weigelt, Helmut (forged) | Germany (1945 Altdöbern), Germany East (Mi 182–, ZKD) | Calw (D), b. 1928, BPP 1968 |
| Weinberg, Dr. Fritz | Germany (Upper Silesia) | Bad Münstereifel-Eschweiler, BPP 1991 |
| Weinbuch, Dieter | Germany (Mi 98–337, Official) | Munich, BPP 1996 |
| Weiner, Julius ('JW') | Estonia | In use 1930–70 |
| Weinert, Dr. Viktor | Czechoslovakia (Posta 1919) | Bratislava 1926, b. 1890, [Flasch] |
| Weiss, H. (head of eagle + number) | Austria | Graz |
| Weiss, Oskar?. Advert. | Yugoslavia (SHS) | Zagreb, pre-WW2, [Flasch] |
| Weiss, Jan | Czechoslovakia (e.g. SO 1920) | Czechoslovakia, pre-WW2, [Flasch] |
| Weiss, William R., Jr. | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Weissenstein, Josef. This mark 'Wss' could be his. | Czechoslovakia (1945–) | Pardubice (Chech Rep.), b. 1947, dealer (Parfilex), SCF 2001 |
| Weka | Switzerland | . |
| Wendel, Theodore | . | St. Brigitte (France) 1961 |
| Wendt, Otto | Portuguese Colonies, Chile, Costa Rica, South and Central America (excl. Haiti, Colombia & Mexico), Seebeck issues | Hamburg-Blankensee, Ulzburg 1968, 1889–1969, BPP 1958–, AIEP 1954–69 |
| Wenkums, Günther | Samos | Düsseldorf, BPP 1976 |
| Wennberg, Harry ('H.W.', also 'G.W.'). Advert. | Sweden, Scandinavia | Stockholm 1926, 1872–1927, dealer, shop later owned by Imre Vajda q.v., [Postryttaren 2004] |
| Werner, A. Budapest | Hungary (occ. ovpt.s) | Sandor (= Alexander) Werner, Budapest 1949, dealer, reliable, [Flasch] |
| Werner, Dr. A(lbert) | German States (Bergedorf and Mecklenburg-Strelitz) | Erlangen 1935, b. 1878 |
| Werner, L. | Rumania | . |
| Wertheimer-Ghika, Jacques | Rumania (pre-1900) | Bucarest 1950 |
| Wertmark Paris | . | . |
| Western Hungary, 2 (arms) | Hungary (Western Hungary) | [Flasch 33, 169] |
| Westoby, W. A. S. | Worldwide | England, 1815–99, philatelist. Note |
| Weston, B. | Europe, Heligoland | England? |
| WF | Germany East (Bezirk 1948) | See Fläschendräger, W. (?) |
| WH (in script) | Honduras | . |
| WHC | USA (Provisionals), Hawaii | See Colson |
| Wiegand, Manfred (forged) | Germany (Mi 31–50, Official I–II), German PO Levant | Göttingen 2003, BPP 1991 |
| Wieneke, Michael | Croatia; German occ. Channel Is.? | Cologne, BPP 1996 |
| Willadt, Carl | German States (Baden), Switzerland | Pforzheim 1897 |
| Williame, U(lmar) E. G. (in blue) | Belgium | Brussels 1943, 1903–76, dealers, AIEP 1954–76, [Soeteman] |
| Willigen, Adriaan M. A. van der | . | Netherlands, 1910–87, AIEP 1972 |
| Willmann, Dr. Erich von | German Colonies, Turkey | Munich 1950, Bad Waldsee, BPP 1961 |
| Wilson, Sir John | Br. Colonies | London, 1898–1975, chairman RPSL Expert Committee 1937–75, AIEP 1954–c.56. Note |
| Winczer, A... (boxed) | Czechoslovakia (Posta 1919), Hungary, Rumania (Regatul) | Alex W., Késmárk, [Flasch] |
| Windel, Wolfgang | Haiti | Norderstedt, b. c. 1945, BPP c. 1982– |
| Winkler, Hartmut | Germany (Official Mi 52–64), German States (Wurttemberg Mi 44–62 & Official) | Owen/Teck 2004, prev. Kirchentellinsfurt (D), b. 1943, BPP 1991 |
| Winter, Richard F. | Transatlantic mails (postal history) | Greensboro NC USA, b. 1937, expert 1991–, AIEP 2002–, [FFE6, PE] |
| Winter-Laczay, György | Hungary (Western Hungary) | Northern Army Chief of Staff, [Flasch] |
| Winterstern, Prof. O. (in Russian) | Russia, Estonia | Zurich, in use c. 1950–70 |
| Wise, P. (manuscrip) | Mauritius, Natal | . |
| Witschi, Hans | Sweden, Denmark, Norway, Finland, Iceland, Greenland | Sumiswald 2001, SBPV until c. 2002 |
| Witt, Helge | Denmark (pre-1885), Danish WI, Sweden, Iceland (pre-1885) | Copenhagen, 1917–77, AIEP 1954–77, BPP 1961 |
| Wittmann, Dr. Heinrich | Germany (Germania issues, Bizone Bauten) | Munich, auctions (still exist), BPP 1958– |
| WOG | Malta | . |
| Wolf, Sigfrido. Certif. | Italy | Firenze 1990s, dealer |
| Wolff, Dr. | Finland | Germany? |
| Wolff, Bernhard | Luxembourg | Luxembourg 1950 |
| Wolford, Kirk | USA, BNA, Br. Colonies | Profess. Stamp Experts 2000 |
| Wowern, Eric v. | Greenland, Faroes | Virum (Denmark) 2000 |
| WRL | Crete | See Libermann |
| Wülbern, Arthur. Advert., 2. | Heligoland, etc. | Hamburg 1905, 1869–1926, dealer |
| Wynnyczok, Don | Ukraine | USA, a collector's mark, UPNS |
| Wyrowyj, Eugene, 'Vyrovyj', 'E. Wyrowyj Praha', 'W' | Ukraine (esp. Podolia) | Prague, b. 1889, prominent collector, UPV, [UPNS] |
| Yablonovskiy, Yuriy | Russia, Soviet Union | See Raritan Stamps Inc. |
| Yamaguchi, Mitsuru | Japan and areas | Japan, ECPM (q.v.) 2001 |
| Yaremdji, Apik and Michel. Note. Advert. | Turkey, Levant POs | Istanbul 1905, 1926, dealers 1885–1930s |
| Zaborsky, Karoly | Hungary (first issues) | Budapest, 1922–2000, AIEP 1984–2000 |
| Zagorsky, Dragomir | Bulgaria, Eastern Rumelia | La Mesa CA (USA), b. c. 1925, formerly VÖB |
| Zampach, Frantiek (posthorn) | Czechoslovakia (typo stamps) | Brno, 1914–2000, SCF |
| Zanetti, Dr. Fiorenzo | Italian occ. Albania, San Marino, Italian PO Libya, Eritrea (postal history) | Milano, b. 1953, expert 1989–, AIEP 1998–, [FFE3, PE] |
| Zanini, Mario | USA, Italy, Switzerland, Venezuela | Bellinzona-Molinazzo (CH), 1914–81, AIEP 1958–81 |
| ZB (in circle) | Yugoslavia | See Boskovic, Zoran |
| Zco, 2, Z.Co | Europe, Switzerland | See Zumstein & Cie |
| Zechmeyer | German States | G. Zehmeyer, Nuremberg c. 1900 ? |
| Zeigler, Robert G. | Switzerland, Liechtenstein | Indianapolis IN 2001 |
| Zeis, Andreas F. (Zeďs) (Α. ΖΕΗΣ) | Greece | Athens |
| Zemis - Riga, O. | Armenia, Azerbaijan, Georgia | See Dzenis |
| Zempel, Dr. Heinrich | Germany (Mi 31–50), Germany East | Nauheim, BPP 1968 |
| Zenker, Gisbert | Austria incl. DDSG and ovpt.s 1945, Lombardy-Venetia, Bosnia & Herzegovina, Austrian PO Levant and Crete | Vienna, 1920–87, AIEP 1967–87, BPP 1976 |
| Zenker, Gottwin (forged) | Germany (pre-WW1, Infla colours, Mi 37), Norway | Vienna 2004, b. 1922, BPP 1976, VÖB |
| Zennert Hamburg, W. | Europe | Hamburg |
| Zierer, Hanns, H. B. Zierer, Hans Zierer, Zierer HBP (from 1991, forged). Some are dealer's marks. | Germany* (all locals and OPDs 1945–6), Germany East* (Mi 182–), Germany (Third Reich and areas), Finland, Soviet Union, etc. *As BPP expert. | Burglengenfeld 1976 2005, dealer, now independent expert, BPP 1968–91 |
| Zimmerl, Prof. Richard | . | Vienna 2001, VÖB a.o. member |
| Zirath, Walter (forged) | German occ. Ukraine, field post 14–15 | Hamburg, BPP 1984 |
| Zirkenbach, Kurt | Germany (Infla), German occ. Etapp. West (only cancels), East (Bezirk 1948) | Halle/Saale 1950, 1895–1972 |
| Zöbisch (scan: Wilhelm van Loo) | German PO China, Great Britain | . |
| Zoscsak, Rudolf | Rumania | Vienna?, b. 1872, expert c. 1920–60 |
| ZP (boxed) | Albania, Epirus, Turkey | See Prendushi |
| Zrinjscak, Predrag | Croatia, Trieste B, Istria B, Yugoslavia | Pforzheim, b. 1946, expert 1985–, AIEP 2000–, [FFE4, PE] |
| Zumstein & Cie, Zco, 2, Z.Co. Certif. Hinge. Note | Europe, Switzerland | Bern, dealers f. 1905, see also Hertsch |
| Zweiling, Arthur | China, Japan, Korea | Bergfelde bei Berlin, 1893–1971, BPP 1961 |
| Zydek, Dr. Hans | German occ. Macedonia & Serbia | Bonn, BPP 1991 |
