M

M South Australia Official overprint (Military).
M Belgium Military Parcel Post overprint.
MA Argentina Official overprint (Ministry of Agriculture).
MACAU, MACAV Macao.
MADAGASCAR Madagascar overprint on stamps of France.
MADEIRA Madeira overprint on stamps of Portugal.
MADERANERTHAL Switzerland Hotel Post.
MADRID Spain, Universal Postal Union Congress.
MAFEKING BESIEGED Cape of Good Hope overprint on stamps of Bechuanaland Protectorate.
MAGDALENA Colombia, Department of Magdalena.
MAGIC LETTER EXPRESS United States Local Post.
MAGYAR Hungary inscription or overprint.
MAGYARORSZAG Hungary.
MAHRA SULTANATE OF QISHN AND SOCOTRA South Arabia.
MAI GT.PRE.1902 Haiti overprint.
Makeaohnja (Resembles these letters) Macedonia.
MALACCA Malaya.
MALAGA Spain overprint.
MALAGASY Madagascar.
MALAWI Formerly Nyasaland.
MALAYAN POSTAL UNION Malaya Postage Due.
MALAYSIA Malay Peninsula and North Borneo.
MALDIVES Maldive islands overprint on stamps of Ceylon.
MALERT BUDAPEST Hungary semi-official air mail.
MALGACHE Madagascar.
MALI Formerly French Colonies of Senegal, French Sudan.
MALMEDY Germany overprint on stamps of Belgium, Belgian Occupation.
MALMO GAMLA Sweden Local Post.
MALUKU SELATAN South Moluccas Private labels.
MALVINAS Argentine name for Falkland Islands.
MANAMA Ajman Dependency.
MANDAL BYPOST Norway Local Post.
MANIZALES Colombia Private Local Post; Antioquia.
MAPKA Finland, Russia, Serbia money unit.
MARCA DA BOLLO Italy Revenue issue.
MARIANAS ESPANOLAS Mariana islands overprint on stamps of Spain, Spanish administration.
MARIANEN Mariana islands overprint on stamps of Germany.
MARICA Inscription on stamps of Somalia.
MARIENWERDER Marienwerder overprint on stamps of Germany.
MARK Germany money unit.
MARKA Estonia, Poland money unit.
MARKKA Finland money unit.
MAROC France inscription or overprint, Offices in Morocco.
MAROCCO Germany overprint, Offices in Morocco.
MAROKKO Germany overprint, Offices in Morocco.
MAROTIRI ISLAND New Zealand Local stamps.
MARRUECOS Spanish Morocco overprint on stamps of Spain.
MARSHALL INSELN Marshall islands inscription.
MARTINIQUE Martinique overprint on stamps of French Colonies.
MARTIN'S CITY POST United States Local Post.
MASON'S NEW ORLEANS United States Local Post.
MATABELELAND Local stamp from Rhodesia.
MAURITANIE Mauritania.
MAURRUECOS Morocco-Northern zone.
MAYREAU One of the islands of Grenadines of St. Vincent.
MAZAGAN Morocco Local Post.
M.B. South Australia Official overprint (Marine Board).
M.B.D. India Official overprint for Feudatory State, Nandgaon.
MBLEDHJA KUSHTETUESE Albania, Italian Dominion.
MPRETNIJA SHQYPTARE Albania, Italian Occupation.
McGREELY'S EXPRESS United States Local Post.
McINTIRE'S CITY EXPRESS POST United States Local Post.
McMILLAN'S CITY DISPATCH POST United States Local Post.
MEARIS' CITY DISPATCH POST United States Local Post.
MECKLENB, SCHWERIN Mecklenburg Schwerln, German State.
MECKLENB STRELITZ Mecklenburg Streiitz, German State.
MEDELLIN Colombia, City of Medellin; Antioquia.
MEDIA ONZA Spain Official stamps.
MEDIO REAL Dominican Republic.
MEF: Middle East Forces, overprint on stamps of Great Britain for Cyrenaica, 1942-48.
MEF: Middle East Forces, overprint on stamps of Great Britain, when Caso transferred to Greece, 1945-47
MEJICO Mexico inscription.
MELAKA Malaysia State issue for Malacca.
MELILLA Morocco Military label.
MEMEL Memel overprint on stamps of France.
MEMELGEBIET Memel overprint on stamps of Germany.
MEMELKLAIPEDA Memel, Lithuanian Occupation.
MENANT& Co. United States Local Post.
MENGE Outer Mongolia.
MENSAJERIAS Uruguay Parcel Post.
MERCANTILE LIBRARY ASSOCIATION United States Local Post.
MERRY CHRISTMAS 1975 United States non-denominated postage stamp, value 10¢, 1975.
MESSENKOPE'S UNION SQUARE United States Local Post.
METALIK Crete, (Russian Sphere of Administration Dist. of Rethymnon).
METELIN Russia overprint, Offices in Turkish Empire.
METROPOLITAN ERRAND & CARRIER United States Local Post.
METROPOLITAN POST OFFICE United States Local Post.
MEXICANO Mexico.
M.G. Argentina Official overprint (Ministry of War).
M.H. Argentina Official overprint (Ministry of Finance).
M.I. Argentina Official overprint (Ministry of the Interior).
MIASTA PRZEDBORZA Poland Local Post.
MIHON Japan Language for Specimen.
MILITARPOST EILMARKE Bosnia and Herzegovlna.
MILIT, MILITAR POST PORTOMARKE Bosnia and Herzegovina.
MILL, MILLIEMES France overprint, Offices in Egypt.
MILLS' FREE DISPATCH POST United States Local Post.
MILY ADMIN Burma overprint.
M.J.I. Argentina Official overprint (Ministry of Justice and Instruction).
M. KIR. Hungary.
M.M. Argentina Official overprint (Ministry of Marine).
MN Korea money unit.
MOCAMBIQUE Mozambique.
MODONES Modena, Italian States.
MOGADOR Morocco Local Post.
MOHLON (Resembles these letters) Mongolia.
MOLDOVA Former USSR Republic of Moldavia.
MON Japan money unit.
MONASTIR Turkey overprint.
MONGTSEU IndoChina overprint (with value in Chinese letters).
MONGTZE France overprint on stamps of IndoChina, Offices in China.
MONROVIA Liberia Registry stamp.
MONSTER: Dutch and Afrikaans word found on stamps of Netherlands and Transvaal indicating "specimen."
MONT ATHOS Russia overprint, Offices in Turkish Empire.
MONTE CARLO Monaco.
MONTE CASSINO Poland (Polish Government in Exile in Great Britain).
MONTENEGRO Montenegro overprint on stamps of Austria and Jugoslavia.
MONTEREY Mexico BOGUS Provisional issue of Monterrey.
MONTEVIDEO Uruguay.
MONTSERRAT Montserrat overprint on stamps of Antiqua.
MOODY'S PENNY DISPATCH United States Local Post.
M.O.P. Argentina Official overprint (Ministry of Public Works).
MOQUEA Peru Provisional issue for Moquea.
MORA Ukraine.
MORELIA Mexico BOGUS Provisional issue for Morelia.
MOROCCO AGENCIES Great Britain overprint on stamps of Gibraltar or Great Britain, Offices in Morocco.
Morris, Robert Postal Card United States non-denominated postal card, value 13¢, 1981.
MORVI India Feudatory State.
MOSTRA Italian Language for specimen.
MOUNT CURRIE EXPRESS South Africa local post stamp.
MOUNT EVEREST EXPEDITION India Local Stamps for Tibet.
MOYEN CONGO Middle Congo inscription.
M.Q.E. Martinique overprint on stamps of French Colonies.
M.R. South Australia Official overprint (Manager of Railways).
M.R.C. Argentina Official overprint (Ministry of Foreign Affairs and Religion).
M.R.G. South Australia Official overprint (Main Roads, Gambierton).
MUESTRA Spanish Language for Specimen.
MUNG Outer Mongolia.
MULTA Chile, Costa Rica, Ecuador, Portugal Postage Due.
MUQDISHO Inscription on stamps of Somalia.
MUSCAT AND OMAN Oman.
MUSEE PHILATELIQUE Switzerland overprint.
MUSTER German Language for specimen.
MUSTIQUE One of the islands of Grenadines of St. Vincent.
M.V.I.R. Romania overprint, German Occupation (Militar Verwaltung in Rumanien).
MYANMAR Formerly Burma.