Inverted 1 Cent United States Postage Due Stamp Appraisals

USSR 1980 Postage Stamp - Jean Auguste Dominique Ingres (Self-Portrait with Vénus Anadyomène)

Republica de Colombia 20 Centavos Postage Stamp (Waterlow & Sons)

Ecuador 1939 'Mision Dolores' Golden Gate International Exposition Stamp

Austrian "Imperial Royal" 60 Heller Postage Stamp (1916 Jubilee Issue)

10 Paise Electric Locomotive Stamp

Mexico 1942 Observatorio Astrofísico de Tonanzintla with Orion Nebula Stamp

French Sower, Allegory of Peace (15 Centimes)

Robert Millikan Commemorative Stamp

10 Centavos Postal Stamp featuring a historical figure

Collection of German Postage Stamps (1928-1947)

Ecuador 3 Centavos Social Security Stamp (1936)

German Reich Postage Stamp Collection (1921-1923)

Used 1928 Mexico 10 Centavos Postal Stamp (Temple of the Cross, Palenque)

1939 Baseball Centenary First Day Cover

Bernardino Rivadavia 10 Centavos Postal Stamp

Nazi Germany 'Reichsparteitag 1936' Postage Stamp

Used 5 (Kreuzer?) Stamp, Orange with Central Cross on Shield

Sheet of 12 (12 Pfennig) German Postage Stamps with Postmarks

1939 Baseball Centenary First Day Cover

Chinese stamp commemorating mountaineering and the 10th anniversary of the People's Republic of China

Russian Empire 15 Kopek Postal Stamp (First Romanov Stamp)

Collection of Early-to-Mid 20th Century Revenue and Definitive Postage Stamps

U.S. Post Office Department Registry Bill, Form No. 1550

Czechoslovakia 1938 Jindřich Fügner 50h Postage Stamp

1939 Baseball Centennial First Day Issue Cover

Anglo-American Occupation Zone Germany AM POST Stamps, 1945 Issue

Iceland 10 Aur Philatelic Stamp featuring Skógafoss Waterfall

Polish 10 Zloty Postal Stamp featuring Józef Piłsudski

Iraqi Postage Stamp featuring King Faisal I (likely 1932-1934 issue)

King George VI and Queen Victoria 1940 Centenary Stamp

Postage Stamp: George VI and Queen Elizabeth (Morocco Agencies)

Block of Four 1976 Helvetia Pro Juventute Stamps (Elderberry Motif)

Russian Empire Postage Stamp, 7 Rubles, Romanov Dynasty (1913-1917 period)

Collection of German 'President Hindenburg' Definitive Postage Stamps (1933 issue)

Ecuador 2 Centavos Airmail Stamp, Golden Gate International Exposition 1939

1939 Cooperstown First Day of Issue Baseball Centenary Stamp Envelope