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| OSTERREICHISCHE POST | Austria |
| OSTERREICHISCHE POST and PORTO | Austria - postage due stamp |
| OSTERREICH and PORTO | Austria - postage due stamp |
| OSTERRPOST | Austria |
| OSTLAND overprinted on stamps of Germany | Russia - German occupation - 1941 |
| OSTROLEKA and POLSKA POCZTA overprinted on stamps of Germany | Poland - local stamp for Ostroleke, Poland - 1918 |
| OTTAWA CONFERENCE 1932 overprinted on stamps of Canada | Canada - 1932 issue to publicize the 1932 Ottawa Economic Conference |
| OUBANGUI-CHARI | Ubangi-Shari |
| OUBANGUI-CHARI overprinted on stamps of Middle Congo | Ubangi-Shari - 1922-1923 |
| OUBANGUI CHARI A.E.F. overprinted on stamps of France | Ubangi-Shari - postage due stamp - 1928 |
| OUBANGUI CHARI AFRIQUE EQUATORIALE FRANCAISE overprinted on stamps of Middle Congo | Ubangi-Shari - 1924-1937? Issues |
| OUBANGUI-CHARI-TCHAD overprinted on stamps of Middle Congo | Ubangi-Shari - 1915-1921 |
| OVS and RDM | Orange Free State - official stamp - 1896-1899 - "Rijdende Dienst Macht" - "mounted police force" |
| O.W. OFFICIAL overprinted on stamps of Great Britain | Great Britain - official stamps - Office of Works |
| P overprinted on stamps of Straits Settlements | Malaya - Perak - 1878 |
| P. overprinted on stamps of South Australia | South Australia - official stamps - Police - 1868-1874 |
| P.A. overprinted on stamps of South Australia | South Australia - official stamps - Protector of Aborigines - 1868-1874 |
| PACCI | Italy and Italian Colonies - parcel post stamp - "pacci postali" - "parcel post" |
| PACCI POSTALI | Italy and Italian Colonies - parcel post stamp - "pacci postali" - "parcel post" |
| PADROES DA GRANDE GUERRA and REPUBLICA PORTUGESE | Portugal - postal tax stamp - 1925 |
| PADROES DA GRANDE GUERRA and REPUBLICA PORTUGESE and PORTEADO A RECEBER | Portugal - postal tax due stamp - 1925 |
| PAHANG | Malaya - Pahang |
| PAHANG overprinted on stamps of Straits Settlements | Malaya - Pahang - 1889-1891 |
| PAHANG overprinted on stamps of Malaya - Perak | Malaya - Pahang - 1898-1899 |
| PAHANG and MALAYA | Malaya - Pahang |
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