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| ORE | Denmark - monetary unit (also used in Greenland) |
| ORE | Norway - monetary unit |
| ORE | Sweden - monetary unit |
| ORGANISATION INTERNATIONALE DU TRAVAIL and TERRETOIRE FRANCAIS DES AFARS ET DES ISSAS | Afars and Issas - 1971 - 'Organisation Internationale du Travail' - 'International Labor Organization' |
| ORGANISATION INTERNATIONAL POUR LES REFUGIES overprinted on stamps of Switzerland | Switzerland - official stamp - international organization for refugees - 1950 |
| ORGANISATION METEOROLOGIQUE MONDIALE and HELVETIA | Switzerland - official stamp - world meteorological organization - 1956-1973 |
| ORGANISATION MONDIALE DE LA PROPERIETE INTELLECTUELLE and HELVETIA | Switzerland - official stamp - world intellectual property organization - 1982-1985 |
| ORGANISATION MONDIALE DE LA SANTE overprinted on stamps of Switzerland | Switzerland - official stamp - world health organization - 1948-1950 |
| ORGANISATION MONDIALE DE LA SANTE and HELVETIA | Switzerland - official stamp - world health organization - 1957-1986 |
| ORO PASTAS and LIETUVA | Lithuania - airmail stamp - 1921-1936 |
| ORTS POST | Switzerland |
| ORTSPOST POSTLOCALE | Switzerland - Zurich |
| OS overprinted on stamps of New South Wales | New South Wales - official stamp |
| OS overprinted on stamps of Papua New Guinea | Papua New Guinea - official stamp |
| OS overprinted on stamps of Trinidad | Trinidad - official stamp |
| OS overprinted on stamps of Liberia | Liberia - official stamp |
| OS overprinted on stamps of South Australia | South Australia - official stamp |
| OS overprinted on stamps of New Guinea | New Guinea - official stamp |
| OS overprinted on stamps of Newfoundland | Newfoundland |
| OS overprinted on stamps of Australia | Australia - official stamp - 'OS' - 'On Service' |
| O.S. G.R.I. overprinted on stamps of German New Guinea | New Britain - official stamp - Georgius Rex Imperator - 1915 |
| O.S.G.S. overprinted on stamps of Sudan | Sudan - official stamp - 1902-1913 |
| OSTEN overprinted on stamps of Germany | Poland - German occupation stamp - 1939 |
| OSTERREICH overprinted on stamps of Germany | Austria - 1945 issues for Lower Austria, Burgenland, and Vienna |
| OSTERREICH | Austria |
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