O) 1961 ARGENTINA, RABINDRANATH TAGORE - INDIAN POET, ANTARCTICA - LUIS MARIA DRAGO - STATESMAN, PROVINCIAS FORMOSA, LUFTHANSA, TO GERMAN
O) 1962 ARGENTINA, IMPERFORATED, UPAE EMBLEM, 50th ANNIVERSARY OF THE FOUNDING OF THE POSTAL UNION OF THE AMERICAS AND SPAIN, MNH
O) 1962 ARGENTINA, ZANCUDO ANOPHELES, WORLD HEALTH ORGANIZATION EMBLEM, FDC XF
O) 1964 ARGENTINA, PROOF, DISCOVERY OF AMERICA, FLORENTINE WOODCUT, DAY OF THE RACE, COLUMBUS DAY, MNH
O) 1964 ARGENTINA, UNESCO, QUEEN NEFERTARI OOFERING PAPYRUS FLOWERS, ABU SIMBEL, CAMPAIGN TO SAVE TH HISTORIC MONUMENTS IN NUBIA, MNH
O) 1966 ARGENTINA, DR. SUN YAT-SEN - MONUMENT TO THE MARTYRS OF THE REVOLUTION GUANGZHOU, FLAG CHINA AND ARGENTINA, MAXIMUM CARD
O) 1966 ARGENTINA, SEA GULL AND SOUTHERN CROSS, NAVAL AVIATION SCHOOL, MNH
O) 1978 ARGENTINA, BIRDS, INTERAMERICAN PHILATELIC EXHIBITION, EXHIBITON AND 1978 SOCCER CHAMPIONSHIP, SCT B75-B79, MNH
O) 1978 ARGENTINA, ORIGINAL PHOTOMECHANICAL, ARGENTINA, HUNGARYM FRANCE ITALY 100p, POLAND, FED, REP, OF GERMANY, TUNISIA, MEXICO 200p, AUSTRIA SPAIN, SWEDEN, BRAZIL, 300p, NETHERLANDS, IRANM PERU SCOTLAND 400p, XF
O) 1983 ARGENTINA, ADMIRAL LUIS PIEDA BUENA, FRIGATE CAPTAIN CARLOS MARIA MOYANO, SOUTHERN PIONEERS AND FAUNA, BIRDS, SEAL WOLF, PENGUINS, FDC XF
O) 1995 ARGENTINA, ORIGINAL PHOTOMECHANICAL, THE LITTLE PRINCE, ANTOINE DE SAINT, PILOT AUTHOR, EXUPERY, LATIN AMERICAN AIR POST PHILATELIC, SCT B164, XF
O) 1995 ARGENTINA, PHOTOMECHANICAL, NATIVE HERITAGE, CAVE DRAWINGS, SHIFTING SANDS, STONE MASK, ANTHROPOMORPHOUS VESSEL, WOVEN TEXTILE, CULTURE, ART, XF
O) 2000 ARGENTINA, RENE FAVALORO, DOCTOR, INVENTOR OF CARDIOSURGEON - DEVELOPMENT OF CORONARY BYPASS, MEDICINE
O) 2000 ARGENTINA, RENE FAVALORO, DOCTOR, INVENTOR OF CARDIOSURGEON - DEVELOPMENT OF CORONARY BYPASS, MEDICINE.
O) 2006 ARGENTINA, SCOUTS - SCOUTING, DIFFERENT CANCELLATIONS OF ACTIVITIES, FDC XF
O) 2015 ARGENTINA, PRESIDENT JUAN DOMINGO PERON - THOUGHT, SOUVENIR MNH
O) 2021 ARGENTINA, NATIONAL RESERVE, TALAMPAYA NATIONAL PARK, PATAGONIA. MOUNT LEON, REGISTERED TO USA
O) 2022 ARGENTINA, NATIONAL PARKS, LANIN, SIERRA DE LAS QUIJADAS, MONTE LEON, BIOSPHERES, NATURAL RESERVES, FLORA, LANDSCAPES, CIRCULATED TO USA
O) 2023 ARGENTINA, CLORINDO TESTA, ARCHITECTURE, BUILDINGS, BOOKLET XF
O) 2023 ARGENTINA, CHINESE HOROSCOPE, YEAR OF THE RABBIT. SPECIAL ISSUE - RABBIT IN SOFT FABRIC, MNH
O) 2023 ARGENTINA, CITY OF JESUS MARIA. PIO LEON FOUNDER - SCULPTURE, ARCHITECTURE, MNH
O) 2023 ARGENTINA, DIPLOMATIC RELATIONS WITH JAPAN, MNH
o) 2023 ARGENTINA, DIPLOMATIC RELATIONS WITH UNITED STATES, BLOCK MNH
O) 2023 ARGENTINA, FIFA WORLD CUP, WORLD FOOTBALL CHAMPIONSHIP QATAR 2022, ARGENTINA CHAMPION, BOOKLET MNH
O) 2023 ARGENTINA, FIFA WORLD CUP, WORLD FOOTBALL CHAMPIONSHIP QATAR 2022, ARGENTINA CHAMPION, MNH
O) 2023 ARGENTINA, FIFA WORLD CUP, WORLD FOOTBALL CHAMPIONSHIP QATAR 2022, ARGENTINA CHAMPION, MNH
O) 2023 ARGENTINA, JULIETA LANTERI, PHARMACEUTICAL - PHYSICIAN - PRECURSOR OF THE RIGHTS OF WOMEN AS CITIZENS - RIGHTS ARE NOT BEGGED THEY ARE CONQUERED, BLOCK MNH
O) 2023 ARGENTINA, ODD SHAPE, FIFA WORLD CUP, WORLD FOOTBALL CHAMPIONSHIP QATAR 2022, ARGENTINA CHAMPION, TROPHY. MNH
O) 2023 ARGENTINA, RESCUE OF THE SWEDISH SCIENTIFIC EXPEDITION -1903, ARA CORVETTE, SHIP, MNH
O) 2023 ARGENTINA, RESCUE OF THE SWEDISH SCIENTIFIC EXPEDITION -1903, ARA CORVETTE, SHIP, MNH
O) 2023 ARGENTINA, TURF - HORSE RACE, NOBLE BREED HORSES, BLOCK MNH