Honegger Philatelie AG
| | Switzerland | 2018 to 2018 | |
D.K. Agencies (P) Ltd.
| D.K. Agencies (P) Ltd (undefined) | India New Delhi | 2017 to 2017 | |
Bertrand Sinais
| Bertrand Sinais (undefined) | France | 2003 to 2003 | |
Richard A Champagne
| New England Stamp Co. (undefined) | United States of America Newton, Mass | 1983 to 1994 | |
Kruschel
| Kruschel (undefined) | Germany Christmas | 1975 to 1992 | |
Ecofil Ltd.
| Ecofil Ltd. (undefined) | Cuba Christmas | 1975 to 1975 | |
Sos-Kinderdorf Briefmarkenabteilung
| Sos-Kinderdorf Briefmarkenabteilung (undefined) | Austria | 1969 to 1969 | |
E. F. Aguilar
| E. F. Aguilar (undefined) | New Zealand | 1956 to 1956 | |
J. A. L. Cooper
| J. A. L. Cooper (undefined) | Ireland | 1955 to 1955 | |
Price & Co.
| Price & Co. (undefined) | Jamaica | 1954 to 1954 | |
The Quaker Stamp Co.
| The Quaker Stamp Co. (undefined) | United States of America | 1953 to 1953 | |
Empire Stamp Shop
| | Barbados | 1951 to 1951 | |
Félix Adolphe Senécal's archive (purchaser of A. Forbin's revenue stock)
| Senécal, Félix Adolphe (undefined) | France Forgery | 1950 to 1960 | |
M. Galvez
| | Switzerland | 1944 to 1944 | |
Corinphila-Liga
| Corinphila-Liga (undefined) | United States of America | 1938 to 1938 | |
Marks Stamp Co.
| Marks Stamp Co. (undefined) | Canada | 1936 to 1936 | |
V. Weiskopf Inc.
| V. Weiskopf Inc. (undefined) | United States of America | 1928 to 1928 | |
Alfred Forbin's archives- correspondence and manuscripts
| Forbin, Alfred (undefined) | France Forgery | 1927 to 1956 | |
G de Haeck
| | Belgium | 1927 to 1928 | |
V Kneitschel
| V. Kneitschel (undefined) | Argentina | 1927 to 1927 | |
A. Maury
| | Germany | 1927 to 1927 | |
C. Kreitz
| C. Kreitz (undefined) | Germany | 1927 to 1927 | |
Zumstein & Cie.
| | Switzerland | 1927 to 1927 | |
Antipodes Stamp Co.
| Antipodes Stamp Co. (undefined) | South Africa | 1927 to 1927 | |
Economist Stamp Co.
| Economist Stamp Co. (undefined) | United States of America New York City | 1927 to 1927 | |
Scott Stamp & Coin Co.
| Scott Stamp & Coin Co. (undefined) | United States of America New York City | 1925 to 1965 | |
F. Doszkar
| F. Doszkar (undefined) | India | 1925 to 1925 | |
Corinphila Auktionen AG (Corinphila Auctions), Switzerland
| | Switzerland | 1925 | |
E. Luder-Edelmann & Co.
| E. Luder-Edelmann & Co. (undefined) | Switzerland Zürich | 1925 to 1927 | |
FL Crahay
| | Belgium | 1924 to 1924 | |
C. H. Needham
| C. H. Needham (undefined) | United States of America New York City | 1921 to 1921 | |
HE Sieger
| H. E. Sieger (undefined) | Austria | 1920 to 1930 | |
C. Seidenberg
| C. Seidenberg (undefined) | United States of America Illinois Beecher | 1916 to 1916 | |
M. Ohlman
| | United States of America | 1914 to 1914 | |
H. P. Bridge
| H. P. Bridge (undefined) | United States of America | 1914 to 1917 | |
PM Mahé
| P. M. Mahé (undefined) | France | 1913 to 1913 | |
H Koehler
| H. Koehler (undefined) | Germany | 1913 to 1938 | |
A. Bullard & Co.
| A. Bullard & Co. (undefined) | United States of America Boston | 1912 to 1912 | |
Eugene Klein
| Eugene Klein (undefined) | United States of America | 1910 to 1910 | |
Windsor Stamp Co, NY
| Windsor Stamp Co. (undefined) | United States of America New York (State) | 1910 to 1910 | |
Toledo Stamp Co.
| Toledo Stamp Co. (undefined) | United States of America | 1909 to 1909 | |
Philipp Kosack
| Philipp Kosack (undefined) | Hungary | 1908 to 1931 | |
Rudolf Kronmann & Co.
| Rudolf Kronmann & Co. (undefined) | Denmark | 1903 to 1903 | |
Nassau Stamp Co., New York City
| Nassau Stamp Co. (undefined) | United States of America New York City | 1903 to 1927 | |
New England Stamp Co. of Boston
| New England Stamp Co. (undefined) | United States of America Boston | 1902 to 1902 | |
Stanley Gibbons album designed to house duplicates
| | France | 1900 to 1900 | |
Arthur A. Bartlett
| Arthur A. Bartlett (undefined) | Canada | 1900 to 1910 | |
E. B. Jones of Sioux City
| E. B. Jones (undefined) | United States of America Sioux City | 1898 to 1898 | |
F. L. Mills of Cincinnati
| F. L. Mills (undefined) | United States of America Cincinnati | 1898 to 1898 | |
H Kroetzsch
| H. Kroetzsch (undefined) | Germany | 1896 to 1897 | |
W. Kuenast
| W. Kuenast (undefined) | Germany | 1895 to 1895 | |
Champion & Co.
| Champion & Co. (undefined) | France | 1894 to 1937 | |
Dawson A. Vindin
| | Australia Sydney Europe | 1891 to 1891 | |
Schaubek
| Schaubek (undefined) | Germany | 1890 to 1892 | |
Montague Jacobs
| Montague Jacobs (undefined) | Spain | 1890 to 1890 | |
JB Moens
| | Belgium | 1889 to 1891 | |
Schwaneberger
| Schwaneberger (undefined) | Germany | 1883 to 1883 | |
Dr Alfred Moschkaus
| | Germany | 1880 to 1880 | |
The American Revenue Association, Manhattan, Kansas
| | United States of America Kansas | | |
The Edgewood Stamp Co.
| | United States of America Connecticut | | |
The Belmont Stamp Co.
| | United States of America Philadelphia | | |
Alfalak Company
| | Singapore | | |
Frasek Company
| | United States of America New York (State) | | |
Vaccari
| | Italy | | |
Forschungsgemeinschaft Internationale Antwortscheine (FIAS)
| Forschungsgemeinschaft Internationale Antwortscheine (FIAS) (undefined) | Berlin Germany | | |
Bernhard Schirmer
| | Germany Hannover | | |
Canal Zone Postal Service Philatelic Agency
| Canal Zone Postal Service Philatelic Agency (undefined) | Panama | | |
Pony Express Philatelie
| Pony Express Philatelie (undefined) | France | | |
Cérès Philatelie Paris
| Cérès Philatelie Paris (undefined) | France | | |
Harmers of New York Inc
| | United States of America New York | | |
D.F. Crew Stamp Dealer
| | Swaziland South Africa | | |