U

U.A.E. United Arab Emirates overprint on stamps of Abu Dhabi.
U.A. EMIRATES United Arab Emirates.
UAPCTBO (Resembles these letters) Bulgaria.
U.A.R. United Arab Republic.
U.A.R. (With value in "p") Syria; (With value in "m") Egypt.
U.C.CO. Canada, Upper Columbia Co. Local Post.
UCIA (On vertically cut half stamp) St. Lucia.
UDINE Italy Local Post.
U.G. (With value) Uganda Protectorate.
UGANDA Uganda overprint on stamps of British East Africa.
UGANDA, EAST AFRICA, KENYA Kenya, Uganda and Tanzania.
UKRAINIAN POST In Russian framed inside a stamp outline on postal meter paper. Applied in Kiev post offices.
UKRAINE Russia overprint on stamps of Germany, German Occupation.
U.K.T.T. Cameroons overprint on stamps of Nigeria, Southern Cameroons.
ULTRAMAR Portuguese Language for specimen.
ULTRAMAR (With year) Cuba, Puerto Rico.
ULTRAMAR (With value in avos or reis) Macao, Portuguese Guinea.
UM Abbreviation of Ouguiya, monetary unit of Mauritania.
UMM AL QUWAIN Persian Gulf Sheikdom.
UNEF India overprint for military stamps.
UNESCO United Nations inscription for Educational, Scientific, and Cultural Organization.
U.N. FORCE (INDIA) CONGO India overprint on military stamps.
"UNGARKSHJAELPEN" Denmark overprint on stamps for Hungarian Refugees.
"UNGARNHILFE" Austria overprint on stamps for Hungarian Refugees.
UNIE VAN ZUID AFRIKA South Africa.
UNION Island in Grenadines of St. Vincent.
UNION FRANCAISE ROYAUME DU LAOS Laos.
UNION INTERNATIONALE DES TELECOMMUNICATIONS Switzerland Official stamps for International Telecommunications Union.
UNION OF SOUTH AFRICA South Africa.
UNION POST United States Local Post.
UNION POSTALE ARABE Libya, Arab Postal Union.
UNION POSTALE UNIVERSELLEHELVETIA Switzerland Official stamps of the Universal Postal Union International Bureau.
UNION SQUARE P.O. United States Local Post.
UNITED REPUBLIC OF TANGANYIKA & ZANZIBAR Tanzania.
UNIVERSAL POSTAL UNION 18741949 (With King George VI and Crown) Great Britain.
UNTEA West Irian overprint on stamps of Netherlands New Guinea for United Nations Temporary Executive Authority.
UOPTO CKPNCOPN (resembles these letters) Romania-Moldavia.
UPHA rOPA Montenegro, Italian Occupation.
UPPER YAFA Part of Aden Protectorate.
U.P.U. Inscription on many stamps for Universal Postal Union.
U.R.I. Jugosiavia overprint, Semipostal without official postal value.
URUNDI German East Africa overprint on stamps of Congo. Belgian Occupation.
U.S. United States.
U S A United States inscription.
USKUB Turkey overprint.
USSR Russia, Union of Soviet Socialist Republics.
UTAH BOGUS stamps of United States.