South America

1981 Air Force Day

1981 The 50th Anniversary of the Bahia Blanca Philatelic and Numismatic Society – Stamp of 1979 Overprinted

1981 The 100 Anniversary of the Naval Observatory

1981 Celebrities’ Anniversaries

1981 Rosette

1981 “Espamer ’81” International Stamp Exhibition, Buenos Aires

1981 The 100th Anniversary of the Military Club

1981 The 20th Anniversary of the Antarctic Treaty

1981 International Congress on Medicine and Sciences applied to Sport

1981 Buildings