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| Oman | SULTANATE OF OMAN overprinted on stamps of Muscat and Oman | Oman - Sultanate of Oman |
| Ontario Law Stamp | GASOLINE TAX overprinted on stamps of Ontario Law Stamp | Canada - revenue stamp - gasoline tax |
| Orange Free State | CSAR overprinted on stamps of Orange Free State | Orange Free State - railway stamp - 1905 - Central South African Railway |
| Orange Free State | CUSTOMS DUTY overprinted on stamps of Orange Free State | Orange Free State - revenue stamp - 1912 - customs |
| Orange Free State | OVS and RDM | Orange Free State - official stamp - 1896-1899 - "Rijdende Dienst Macht" - "mounted police force" |
| Orange Free State | RDM and OVS | Orange Free State - official stamp - 1896-1899 - "Rijdende Dienst Macht" - "mounted police force" |
| Orange River Colony | ORANGE RIVER COLONY overprinted on stamps of Cape of Good Hope | Orange River Colony |
| Orange River Colony | ORANJE VRIJ STAAT | Orange River Colony - "Oranje Vrij Staat" is German for "Orange Free State" |
| Pakistan | ANNA | Pakistan - monetary unit |
| Pakistan | BAHAWALPUR | Pakistan - Bahawalpur |
| Pakistan | PAKISTAN overprinted on stamps of India | Pakistan - 1947-1949 |
| Pakistan | SERVICE overprinted on stamps of Pakistan | Pakistan - official stamp |
| Pakistan | U.N. FORCE W. IRIAN overprinted on stamps of Pakistan | Pakistan - 1963 - commemorating Pakistan military forces leaving to take part of the United Nations force in West New Guinea |
| Palestine | EEF | Palestine - British Military Administration - Egyptian Expeditionary Force - 1918-1922 |
| Palestine | HJZ overprinted on stamps of Palestine | Palestine - revenue stamp - 'HJZ' - 'Hedjaz' railway |
| Palestine | PALESTINE overprinted on stamps of Egypt Expeditionary Force | Palestine - 1920-1922 |
| Panama | ANTILLA PACIFICO overprinted on stamps of Colombia | Panama - circa 1887 issues |
| Panama | AR | Panama - acknowledgement of receipt stamp |
| Panama | AR overprinted on stamps of Panama | Panama - acknowledgement of receipt stamp |
| Panama | CANAL ZONE overprinted on stamps of Panama | United States of America - Canal Zone |
| Panama | CORRESPONDENCIA A DEBE | Panama - postage due stamp |
| Panama | ENTREGA IMMEDIATA | Panama - special delivery stamp |
| Panama | E S DE PANAMA | Panama - early issues under Colombia administration |
| Panama | EXPRESSO overprinted on stamps of Panama | Panama - special delivery stamp |
| Panama | LUCHA CONTRA EL CANCER overprinted on stamps of Panama | Panama - postal tax stamp |
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