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and contact details. (Please read the introduction.)
Names A–F, Names M–R,
Names S–Z, Areas A–E,
Areas F–G, Areas H–R,
Areas S–Z, First names,
All, Stamp Forgery Guide
| Signature/name | Expertising area | Details (b. born, d. dead, f. founded) |
| 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). Photo | Germany (Infla incl. Official) | Berlin-Spandau, 1923–2007, BPP 1958–98 |
| 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 |
| GK in Cyrillic, 'ГК' in circle | Russia, Ukraine | See Gosudarstvennaya kontora |
| 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 (Mi 660–) | Vienna 2004, BPP 2008–, 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' or 'ГК' in circle | 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. Certif. | 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; '-Grenstedt-' | 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). Certif. | German States and Colonies, Montenegro, Worldwide (pre-1900) | Hannover 1943, 1899–1994, auctioneer, BPP 1958–, AIEP 1954–82 |
| Grønlund, Svend (Gronlund, Groenlund). Certif. Photo | Denmark, Iceland, Finland, Sweden, Brazil | Copenhagen 1969, d. 1970s, also on forged. Note |
| Grothe | Germany (air mails) | . |
| Grubben, Willy (or manuscript) | Belgium | Brussels 1943, dealer, [Soeteman] |
| Gruber, Gunnar. Certif. | Germany (Upper Silesia, Schleswig) | Radolfzell, BPP 2001 |
| Gryzel, Jerzy | Poland (no. 1, cities, plebiscite, Gdansk) | Lodz 2008, Polish Fed. |
| 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, Thomas William | 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, d. c.2005, 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 Båstad |
| Harder, Dr. Philipp | Germany (1945–6 locals) | Hauenstein 2003, b. 1968, BPP 1996 |
| Harlos, Peter/Friedrich | Germany (Notopfer, Wohnungsbau) | Wunstorf, BPP 1980 |
| Harman, Christopher G. (Works as member of committee (RPSL).) | Great Britain and Colonies | Woodbridge, b. 1950, expert 1985–, AIEP c.2006– |
| 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, Charles 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. Certif. | China (Formosa), Chinese PO Tibet, India (excl. States), Nepal, Iran (Persia –1891) | Munich, b. 1936, expert 1969–, BPP 1976 until 2006, 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. Certif. 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. Certif. | 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. Certif. | 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., 2 | 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., Herman | 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). Certif. | 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 |
| Ho, Michael M. Y. | China (–1900) | Kaohsiung (TW), b. 1946, AIEP c.2006– |
| 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. Certif. 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 |
| Hohmann, Jan | Germany (Allied occ. 1946–48 colours) | Brunswick 2007. Note |
| Holcombe, Peter (manuscript). Certif., 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. Certif. | 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. Certif. | German States (Wurttemberg) | Friedrichshafen 2001, BPP 2003 |
| Isaac, Charles | France and Colonies, Uruguay | Marseille, b. 1922, dealer, expert 1950–, AIEP 1975–, [FFE3, PE] |
| Isaksen, Jan Kr. | Norway (locals) | Engelsviken, expert 2002–. Note |
| 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). Certif. | 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, b. 1940, 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 |
| Kajtna, Konrad | Croatia (1918 Sailors, pre-adh.) | Brezice 2006, CPS |
| Káldor, Dr. | Fiume | . |
| Kalinowski, Mariusz | Poland (locals, PO Port Gdansk) | Warsaw 2000, Polish Fed. |
| Kálmán | Hungary (Debrecen) | Dealer, on forged, [Flasch] |
| KAN | Sweden (1920–36) | See Norsten, Karl-Arne |
| 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, b. 1939, expert 1999–, SBPV, AIEP 2005–, [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 |
| Kašpar, 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. Homepage | 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) 1991–, 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 |
| Kleymann, Uwe | German occ. WW2 Serbia | Ritterhude, BPP 2007– |
| 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 |
| Klosinkski, Andrzej | Poland (Air mails) | Sopot 2008, Polish Fed. |
| 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 |
| Københavns 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] |
| Kontrollrat, ArGe | Germany (Allied occ. 1946–48 colours) | See Bernhöft and Hohmann resp. |
| 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. –c.2005 |
| 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. Certif. | Portugal (Mi 1–700) | Dresden, BPP 1991 |
| Krgr | German States, Russia (areas) | See Krüger |
| Krickmeyer, Edgar | Latvia | Merzen ü. Bramsche 1950 |
| Krischke, Gerhard (forged). Certif. | 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. Certif. | 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 (1944–) | 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. Certif. | 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 |
| Lešetický, Jaroslav ('Lý', forged). Photo | Czechoslovakia (Posta 1919), Hungary | Czechoslovakia, 1866–1936, initiator of the Posta 1919 ovpts, expert c. 1920–, not reliable. [Flasch] |
| Lešetický Ustredna (also boxed) (Leseticky) | Czechoslovakia | Lešetický 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 |
| Londoño-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 1978–2006, [FFE2 5 6] |
| Lorenc, Jaroslav | Czechoslovakia | Czechoslovakia, SCSF expert 1957– |
| Lossau, J. | German States (Hamburg), France and Colonies | Hamburg 1897 |
| Louis, Dr. Albert. Certif. | Netherlands | Hürth, b. 1925, expert 1976–, BPP 1976–, AIEP 1983–, [FFE1 3, PE] |
| Louis, Karl-Albert. Certif. | 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. Certif. | Germany (Bizone Bauten Mi 73–100) | Giessen, BPP 1980 |
| Lý | Czechoslovakia (Posta 1919) | See Lešetický |
| 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 |