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O
O.A. South Australia Official overprint (Official
Assignee).
OAHA MAPKA Finland.
OAXACA Mexico Civil War issue.
OAYMrArQNEE (Resembles these letters) Greece.
O.B. Philippines Official overprint.
OBELISK Ethiopia overprint.
OBOCK Obock overprint on stamps of French Colonies,
currently Djibouti.
OCCUPATION AZIRBAYEDJAN Azerbaijan overprint on
stamps of Russia.
OCCUPATION FRANCAISE Hungary overprint, French
Occupation.
OCCUPATION FRANEAISE DU CAMEROUN: overprint on stamps
of French and Middle Congo,1916.
OCCUSSI-AMBENO Timor BOGUS Labels sold as stamps for
nonexistent Principality.
OCEANIE French Polynesia.
ODENSE BYPOST Denmark local post.
OESTERREICH Austria.
OESTERR POST Austria, With name of Liechtenstein,
Austrian Postal Administration.
OEUVRES DE SOLIDARITE FRANCAISE French Colonies
General issue.
OF CASTELLORISCO Casteilorizo overprint on stamps of
France.
O.F. CASTELROSSO: Occupation Franeais, 1920, for
Castellorizo, Castelrosso, 1920.
OFFENTLIG SAK Norway Official Use.
OFFICIAL Tanganyika overprint on stamps of Kenya and
Uganda.
OFFICIEL Luxembourg, Switzerland Official
overprint.
OFFISIEEL (Without Official) South West Africa.
OFFISIEEL OFFICIAL Union of South Africa.
OFF SAK Norway.
OFICIAL Portugal, Spain Official overprint.
OFTERREICH Austria.
O.H.B.M.S. Great Britain Official overprint for "On
His Brittanic Majesty's Service."
O.H.E.M.S. Egypt Official overprint for "On His
Exalted Majesty's Service."
O.H.H.S. Egypt Official overprint for "On His
Highness" Service."
O.H.M.S. Great Britain Official overprint for "On His
Majesty's Service."
OHU POST Estonia air mail.
OIL RIVERS Niger Coast Protectorate.
OKCA Russia Army of the North Issue.
OLTRE GIUBA Oltre Gluba, Jubaland overprint on stamps
of Italy.
OLYMPIC GAMES-1948 Great Britain.
OMAN, STATE OF Arabia Propaganda Labels.
O.M.F. SYRIE Syria overprint on stamps of France.
ON C.G.S. India overprint for Feudatory State of
Cochin.
ONE ANNA India Feudal State of Jasdan.
ONE CENT DISPATCH United States Local Post.
O.N.F. CASTELLORIZO Occupation Navale Franeais, for
Castellorizo, Castelrosso, 1920.
ON H.M.S. India Official overprint for "On Her
Majesty's Service."
ON K.S.D. India Official overprint for Feudatory
State of Kishengarh.
ON S.S. India Official overprint for Feudatory State
of Travancore,
ON S.S.S. India Official overprint for Feudatory
State of Sirmoor.
ON STATE SERVICE Iraq Official overprint, British
Mandate.
ONZA Spain money unit.
OOHAb CAHATOPNYMb (Resembles these letters)
Bulgaria.
ORGANISATION INTERNATIONAL LES REFUGIES Switzerland
overprint.
ORGANISATION METEOROLOGIQUE MONDIALE Switzerland
overprint.
ORGANISATION MONDIALE DE LA SANTE Switzerland
overprint.
OR K.C. NOVITA Serbia.
ORTSPOST (POSTE LOCALE) Switzerland Federal
Administration.
ORVAL Belgium.
O.S. Australian States overprint (On Service).
O.S. Norway Official stamps.
OPSO New Zealand Official overprint (On Public
Service Only).
ORANGE RIVER COLONY Orange River Colony overprint on
stamps of Cape of Good Hope.
ORANGE VRIJ STAAT Orange River Colony.
ORCHHA India Feudatory State.
ORE Denmark, Norway, Sweden money unit.
O.S.G.R.I. New Britain overprint on stamps of German
New Guinea.
O.S.G.S. Sudan Official overprint.
OSTEN Poland overprint on stamps of Germany.
OSTERREICH Austria.
OSTERREICHISCHE POST Austria.
OSTLAND Russia overprint on stamps of Germany, German
Occupation.
O.T. Czechoslovakia overprint.
OTVORENIE SLOVENSKENO Czechoslovakia overprint.
OUBANGUI-CHARI-TCHAD overprint for Central African
Republic, Republique Centrafricaine 1910
OUBANGI-CHARI: overprint for Central African
Republic, Republique Centrafricaine 1922
OUBANGI-CHARI/AFRIQUE EQUATORIAL FRANCIASE: overprint
for Central African Republic, Republique Centrafricaine,
1924.
OVERTON & CO. United States Local Post.
O.W. OFFICIAL Great Britain Official overprint
(Office of Works).
OYMATIKQN T.T.T. (Resembles these letters)
Greece.
OZ Peru.
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