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| OFICIAL and HONDURAS | Honduras - official stamps |
| OFICIAL and NICARAGUA | Nicaragua - official stamps |
| OFICIAL and PARAGUAY | Paraguay - official stamps |
| OFICIAL and VENEZUELA | Venezuela - official stamps |
| OFTERREICH overprinted on stamps of Germany | Austria |
| OHEMS overprinted on stamps of Egypt | Egypt - official stamp - 1922-1923 - 'OHEMS' - 'On His Exhaulted Majesty's Service'' |
| OHHS overprinted on stamps of Egypt | Egypt - official stamp - 1907-1922 - 'OHHS' - 'On His Highness's Service' |
| OHMS overprinted on stamps of Cook Islands | Cook Islands - official stamp - 'OHMS' - 'On His Majesty's Service' |
| OHMS overprinted on stamps of Niue | Niue - official stamp - 'OHMS' - 'On His Majesty's Service' |
| OHMS overprinted on stamps of Canada | Canada - official stamp - 'OHMS' - 'On His Majesty's Service' |
| OHMS overprinted on stamps of Montserrat | Montserrat - official stamp - 'OHMS' - 'On His Majesty's Service' |
| OHMS overprinted on stamps of Penrhyn Island | Penrhyn Island - official stamp - 'OHMS' - 'On His Majesty's Service' |
| OHMS overprinted on stamps of Egypt | Egypt - official stamp - 'OHMS' - 'On His Majesty's Service' |
| OHMS overprinted on stamps of Aitutaki | Aitutaki - official stamp - 'OHMS' - 'On His Majesty's Service' |
| OIL RIVERS overprinted on stamps of Great Britain | Niger Coast Protectorate |
| OKCA | Russia - Army of the North - 1919 |
| OLD GLORY and USA G FIRST CLASS PRESORT | United States of America - nondenomiated stamp/no value indicated - 1994 - 25 cent face value - rate for presorted first class mail - "Old Glory" is a nickname for the USA flag |
| OLD GLORY and USA G FOR U.S. ADDRESSES ONLY | United States of America - nondenomiated stamp/no value indicated - 1994 - 32 cent face value - rate for first class domestic postage - "Old Glory" is a nickname for the USA flag |
| OLD GLORY and USA G NONPROFIT PRESORT | United States of America - nondenomiated stamp/no value indicated - 1995 - 5 cent face value - rate for nonprofit (usually a charity) organization's mail - "Old Glory" is a nickname for the USA flag |
| OLD GLORY and USA G POSTCARD RATE | United States of America - nondenomiated stamp/no value indicated - 1994 - 20 cent face value - rate for postcards - "Old Glory" is a nickname for the USA flag |
| OLSZTYN ALLENSTEIN and PLEBISCITE overprinted on stamps of Germany | Allenstein - 1920 |
| OLTRE GIUBA overprinted on stamps of Italy | Oltre Giuba - 1925-1926 |
| OLTRE GIVBA | Oltre Giuba |
| O.M.F. CILICIE overprinted on stamps of France | Cilicia - French administration - "Occupation Militaire Francaise" - "French Military Occupation" |
| O.M.F. SYRIE overprinted on stamps of France | Syria - postage due stamp - 1920-1922 - 'OMF' - 'Occupation Militaire Francaise' - 'French Military Occupation' |
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