M. B. (overprint): South Australia, officials (1868-74) [Marine Board].

MACAU: Macao.

MACAV: Macao.

MADAGASCAR (overprint on stamps of France): Madagascar (1895).

MADEIRA (overprint on stamps of Portugal): Madeira (1868-98).

MADERANERTHAL: Switzerland, hotel local stamp.

MADRID: Spain (1920-30).

MAFEKING (overprint on stamps of Bechuanaland): Cape of Good Hope (1900).

MAFEKING (overprint): Cape of Good Hope (1900).

MAGYAR: Hungary.

MAGYAR KIR. HIRLAP BELYEG: Hungary, newspaper tax stamps.

MAGYAR KIR(ALYN) POSTA: Hungary [Hungarian Royal Post].

MAGYAR NEMZETI KORMANY SZEGED (overprint): Hungary- Szeged- Serbian occupation (1919) [Hungarian People’s Government Szeged].

MAGYAR NEPKOZTARSASAG: Hungary (1919) [People’s Popular Republic].

MAGYARORSZAG: Hungary (1925) [Hungarian State].

MAGYAR TANACS KOZTARSASAG: Hungary (1919) [Hungarian Soviet Republic].

MAHRA SULTANATE OF QISHN AND SOCOTRA: South Arabia (1967).

MAI GT. PRE. 1902 (overprint): Haiti (1902) [Gouvernement Provisoire (Provisional Government)].

M.A.L.: cancel of British Forces in North and East Africa [Military Authority Lira].

MALACCA: Malaya- Malacca.

MALAGA (overprint): Spain revolutionary issues- Malaga (1937).

MALAGA ARRIBA ESPANA (overprint): Spain- Malaga, revenues.

MALAGASY: Madagascar (1961-present).

MALAYA (overprint over portrait of Sultan): Malaya- Kelantan, Negri Sembilan, Pahang, Perak, Perlis, Selanegor or Trengganu.

MALAYA (overprint over picture of mosque): Selangor.

MALAYA (overprint over picture of over picture of State Arms): Negri Sembilan.

MALAYAN POSTAL UNION: Malaya, postage dues (1945).

MALAYA PERLIS: Malaya- Perlis.

MALAYA SINGAPORE: Singapore.

MALDIVES (overprint on stamps of Ceylon): Maldives Islands(1906-9).

MALGACHE: Madagascar (1959-61).

MALMEDY (overprint on stamps of Belgium): Germany- Belgian occupation of Melmedy (1920-1).

MALUKA SELATAN: South Moloccas (Indonesian private issues).

MANAMA: Ajman- Manama.

MANDAT: Netherlands, money order stamps (1894).

MANIZALES: Colombia- Manizales.

MAPKA: Russia, Finland or Serbia.

MARCA DA BOLLO: Italy.

MARIANAS ESPANOL (overprint on stamps of Spain): Mariana Islands (1899).

MARIANEN: Mariana Islands (1899-1919).

MARIENWERDER (overprint on stamps of Germany): Marienwerder plebescite (1920).

MARK (currency): Finland, Germany.

MARKA (currency): Estonia (1919-28), Russia.

MARKAA (currency): Finland.

MARKKA (currency): Finland.

MAROC: French Morocco, Morocco.

MAROCCO (overprint on stamps of Germany): Germany- Offices in Morocco.

MAROKKO (overprint on stamps of Germany): Germany- Offices in Morocco (1911).

MARRUECOS: Morocco- Northern Zone (1956-8).

MARRUECOS (overprint on stamps of Spain): Spanish Morocco.

MARRUECOS ESPANOL: Spanish Morocco- Northern Zone.

MARSHALL INSELN: Marshall lslands.

MARTINIQUE (overprint on stamps of French Colonies): Martinique (1886-92).

MARSCHELL INSELN: Marshall Islands.

MAURITANIE: Mauritania.

MAGAZON A MOROC: Sultanate of Morocco, local issue of questionable repute (1891) [Mazagan to Morocco].

MAGAZON MARAKECH: Sultanate of Morocco, local issue of questionable repute (1893) [Mazagan to Marakesh].

MAT TUAN D.T.G.P. MIEN NAM VIET NAM: National Front for the liberation of South Vietnam.

MAZATLAN (overprint): Mexico- Mazatlan (1916).

M.B.D. (overprint): India- Nandgaon, officials (1893-5).

MBLEDHJA KUSHTETUGESE (overprint on stamps of Italy): Albania- Italian dominion (1939).

MBRETNIJA SHQIPTARE: Albania- Italian occupation.

MECKLENB.: German States- Mecklenburg-Schwerin (1856-67).

MEDELLIN PROVISIONAL: Colombia- Antioquia (1888-9).

MEDIA ONZA: Spain, official stamps (1854-63).

M.E.F. (overprint on stamps of Great Britain): Great Britain- Offices in Africa (1942-50) [Middle East Forces].

MEJICO: Mexico (1856-64).

MELAKA: Malaysia- Malacca.

MELAT-I-KAZERUN 1335 (overprint): Iran, unofficial rebellion overprint (1917).

MEMEL (overprint on stamps of France): Memel (1920-3).

MEMEL with KLAIPEDA: Memel- Lithuanian occupation (1923).

MILLIEME(S) (currency surcharge on stamps of France): France- Offices in Egypt (1921-8).

M.J.I. (overprint): Argentina, officials [Ministry of Justice and Education].

M. KIR.: Hungary (1916).

M.M. (overprint): Argentina, officials [Ministry of Marine].

MN: Korea (1884-95).

MOCAMBIQUE: Mozambique.

MOHΓOЛ ЩЧAAH: Outer Mongolia.

MOGADORO A MAROC: Sultanate of Morocco, local issue of questionable repute (1895) [Mogadoro to Morocco].

MONGTSEU (overprint on stamps of Indo-China): France- Offices in China- Mongtseu (1903-9).

MONGTZE (overprint on stamps of Indo-China): France- Offices in China- Mongtseu (1903-9).

MONISTIR (overprint on stamps of Turkey): Turkey, for royal visit of Sultan to Rumelia (1911) [City of Monistir].

MONROVIA: Liberia.

MONSTER (overprint): Dutch language countries [Specimen].

MONT ATHOS (overprint on stamps of Russia): Russia- Offices in Turkey- Mont Athos (1909-10).

MONTE CASSINO 1944 (overprint on stamps of Poland-Exile in Great Britain): Polish government in exile (1944).

MONTENEGRO (overprint on stamps of Austria): Montenegro- Austrian occupation (1917-8).

MONTENEGRO (overprint on stamps of Italy): Montenegro- Italian occupation (1941-2).

MONTEREY (overprint): Mexico- Monterey.

MONTEVIDEO: Uruguay- Montevideo (1858-67).

MONTSERRAT (overprint on stamps of Antigua): Montserrat (1876).

M.O.P. (overprint): Argentina, officials [Ministry of Public Works].

MOQUEA (overprint): Peru- Moquegua- Chilean occupation (1885).

MOQUEGUA (overprint): Peru- Moquegua, applied after regional earthquake (1881).

MOQUEGUA (overprint on stamps of Arequipa): Peru- Arequipa- Moquegua- Chilean occupation (1885).

MORA: Ukraine.

MORELIA (overprint): Mexico- Morelia.

MORROCCO AGENCIES (overprint on stamps of Gibraltar): Great Britain- Offices in Morocco.

MORROCCO AGENCIES (overprint on stamps of Great Britain): Great Britain- Offices in Morocco.

MORVI: India- Morvi (1931-48).

MOYEN CONGO: Middle Congo.

MQE (overprint on stamps of French Colonies): Martinique (1886-91).

M. R. (overprint): South Australia, officials (1868-74) [Manager of Railways].

M.R.C. (overprint): Argentina, officials [Ministry of Foreign Affairs and Religion].

M. R. G. (overprint): South Australia, officials (1868-74) [Main Roads Gambierton].

MUESTRA (overprint): Spanish language countries [Specimen].

MULTA: several countries, postage dues [Fined].

MULTADA: Chile, postage dues[Fined].

MULTAS: Ecuador, postage dues[Fined].

MUSCAT & OMAN: Oman (1966-70).

MUSTER (overprint): German language countries [Specimen].

M.V.i.R. (overprint): Romania- German occupation (1917-8) [Militar Verwaltung in Rumanien (Military Administration of Romania].

NABHA: India- Nabha.

NACHMARKE (overprint): Austria, postage dues.

NACH PORTO (overprint): Liechtenstein, postage dues [After Postage].

NACIONES UNIDAS: United Nations.

NANDGAM: India- Nandgam (1891-5).

NADRUK (underprint): Netherlands (1852) [Reprint].

NA OSWIATE: Poland, semipostals [For Public Instruction].

NAPA PARA (currency): Yugoslavia, Croatia, Serbia, Slovenia.

NAPOLETANA: Italian States-Two Sicilies.

NA SKARB NARODOWY: Poland, semipostals [For National Funds].

NA SLASK (overprint): Central Lithuania.

NATIONALER VERWALTUNGS AUSSCHUSS 10.XI 1943 (overprint): Yugoslavia and Montenegro- German occupation of Montenegro (1943).

NATIONALSOZIAL DEUTSCHE ARBIETERPARTE: Germany, franchise stamps [National Socialist German Worker’s party].

NATIONAL VERSAMMLUNG: Germany (1919) [National Assembly].

NATIONS UNIES: United Nations.

NATIONS UNIES OFFICE EUROPEEN (overprint on stamps of Switzerland): Switzerland, officials [United Nations European Office].

NAURU (overprint on stamps of Great Britain): Nauru (1916-23).

N.C.E. (overprint on stamps of French Colonies): New Caledonia (1881-93).

N.D. HRVATSKA: Croatia.

N.D. RATNI DOPRINOS: Croatia.

Nebr. (overprint): U.S. Nebraska overprints to reduce theft (1929).

NED ANTILLEN: Netherlands Antilles (1949-present).

NEDERLAND: Netherlands.

NEDERLANDSCH-INDIE: Netherlands Indies (1864-1949).

NEDERLANDSE ANTILLEN: Netherlands Antilles (1949-present).

NEDERLANDS NIEUW GUINEA: Netherlands New Guinea (1950-62).

NEDERL-INDIE: Netherlands Indies (1864-1949).

NED-INDIE: Netherlands Indies (1864-1949).

NED NIEUW GUINEA: Netherlands New Guinea (1950-62).

NEGRI SEMBILAN: Malaya- Negri Sembilan.

NE PAS LIVRER LE DIMANCHE: Belgium label (French inscription) preventing Sunday mail delivery (1893-1915) [Do Not Deliver Sunday].

NEU-GROSCHEN (currency): German States- Saxony.

NEW GRANADA: Colombia (pre 1862).

NEW HEBRIDES CONDOMINIUM (overprint on stamps of Fiji): New Hebrides (1908-10).

NEZAVISNA DRZAVA HRVATSKA: Croatia, postal tax stamps.

N.F. (overprint on stamps of Nyasaland): German East Africa- British occupation (1917) [Nyasaland Force].

N. FL.: Armenia.

NIET BESTELLEN OP ZONTAGE: Belgium label (Flemish inscription) preventing Sunday mail delivery (1893-1915) [Do Not Deliver Sunday].

NIEUW GUINEA: Netherlands New Guinea (1950-62).

NIEUW REPUBLIEK ZUID AFRIKA: New Republic.

NIPPON: Japan (1966-present).

NISIRO (overprint on stamps of Italy): Italy- Aegean Islands- Nisiro (1932-32).

NISIROS (overprint on stamps of Italy): Italy- Aegean Islands- Nisiro (1912-22).

NIUE (overprint on stamps of New Zealand): Niue.

NIVINI (overprint on special delivery stamps): Czechoslovakia, newspaper stamps.

NIWIN (overprint): Curacao, semipostals [initials of an Indonesian relief agency].

NLLE. CALEDONIE (overprint on stamps of French Colonies): New Caledonia (1892).

NO HAY ESTAMPILLAS (overprint): Colombia (1912) [There are no stamps].

NOPTO MAPKA: Serbia, postage dues.

NORDDEUTSCHER POST-BEZIRK: German States- North German Confederation (1868-71) [North German Postal Circuit].

NORD-DEUTSCH-POST: German States- North German Confederation, officials (1870-1).

NOREG: Norway (1951).

NORFOLK ISLANDS (overprint on stamps of Australia): Norfolk Islands (1959).

NORGE: Norway.

NOSSI-BE (overprint on stamps of French Colonies): Nossi-Be (1891-4).

NOUVELLE CALEDONIE: New Caledonia (1905-present).

NOUVELLES HEBRIDES: New Hebrides- French issues.

NOUVELLES HEBRIDES (overprint on stamps of New Caledonia): New Hebrides- French issues.

NOWANUGGUR: India- Nowanuggur (1877).

NOWTA: Serbia.

ПOYTA: Russia.

ПOYT MAPKA (no country name): Azerbaijan (1922-4).

NSB (overprint on stamps of French Colonies): Nossi-Be (1890-3).

N. SEMBILAN: Malaya- Negri Sembilian.

N.S.W.: New South Wales.

N. T. (overprint): South Australia, officials (1868-74) [Northern Territory].

N.W. PACIFIC ISLANDS (overprint on stamps of Australia): North West Pacific Islands (1915-6).

NYASSA (overprint on stamps of Mozambique): Nyassa (1898).

N.Z.: New Zealand.

OLYM: Greece.

OLYMП: Greece.

OLYMПIAKOI: Greece.

O. A. (overprint): South Australia, officials (1868-74) [Official Assignee].

OAHA MAPKA: Finland (1866-74).

OAXACA: Mexico- Oaxaca (1914).

O.B. (overprint): Philippines, officials (1906-present) [Official Business].

OBOCK (overprint on stamps of French Colonies): Obock.

OCCUPATION AZIRBAYEDJAN (overprint on stamps of Russia): Azerbaijan, unofficial overprints by Entente Allied officers (1918).

OCCUPATION FRANCAISE (overprint): Hungary- French occupation (1919).

OCCUPATION FRANCAISE CAMEROUN (overprint on stamps of Middle Congo): Cameroon- French occupation.

OCEANIE: French Polynesia (1892-1958).

OCUPACION DE PASQUA: Chile, semipostal for Easter Island.

OДHA MAPKA YKSIMAPKKA: Finland.

OESTERR: Austria (1883-1907) [Austria].

OESTERR POST with KAIS KOENIGL: Austria (1883-1907).

OESTERR POST LIECHTENSTEIN: Liechtenstein- Austrian postal administration (1912-20).

OEUVRES DE GUERRE (overprint): Cameroon, semipostals.

OEUVRES DE SOLIDARITE FRANCAISE: French Colonies, semipostals (1943-4).

OEUVRES SOCIALES (overprint on stamps of St. Pierre & Miquelon): St. Pierre & Miquelon, semipostals.

O.F. CASTELLORISO (overprint on stamps of France): France- Castellorizo occupation.

OFFENTLIG SAK: Norway, officials.

OFFICIAL (overprint on stamps of Kenya and Uganda): Tanganyika, officials (1959-60).

OFFISIEEL: South West Africa, officials.

OFFISIEEL-OFFICIAL: South Africa, officials.

OFF. SAK.: Norway, officials.

OFFICIEL (overprint): Luxembourg, officials.

OFFICIEL (overprint): Iran, officials denoting genuiness (1885-7).

OFICIAL: Spanish or Portuguese language countries [Official].

O.Ф. (overprint with airplane): Bulgaria, airmails.

O.H.E.M.S. (overprint): Egypt, officials (1922).

O.H.H.S. (overprint): Egypt, officials (1907-1922) [On His Highness’ Service].

O.H.M.S. (overprint): Canada, officials [On His (or Her) Majesty’s Service].

OHU POST: Estonia, airmails.

OIL RIVERS: Niger Coast Protectorate (1892-3).

OKCA: Russia- Army of the North (1919) [Odjeiny Korpus SevernoyArmii].

O.K.C.A. POCCIЯ: Russia- Army of the North (1918).

O.L. (overprint): Monaco, letters handed to mailmen or found in post boxes prior to 1908 [Origine Locale (Local Origin)].

OLTRE GIUBA (overprint on stamps of Italy): Oltre Giuba.

O.M.F. CILICIE (overprint on stamps of France): France- occupation of Cilicia.

O.M.F. SYRIE (overprint on stamps of France): Syria (1920-22) [Occupation Militaire Francaise (French Military Occupation)].

ON C.G.S. (overprint on stamps of India- Cochin): India- Cochin, officials [On Cochin Government Service].

O.N.F. CASTELLORIZO (overprint on stamps of French Levant): France- Castellorizo occupation [Occupation Navale Francaise (French Naval Occupation)].

ON K.D.S. (overprint): India- Kishangarah, officials [On Kishengarh Durbar Service].

ON L.F.S. (overprint): India, private overprints to prevent theft [On Local Funds Service].

ON S.S. (overprint): India- Travanacore, officials.

ON S.S.S. (overprint): India- Sirmoor, officials [On Sirmoor State Service].

ON STATE SERVICE (overprint): Iraq, officials.

ONZA: Spain, officials [Ounce].

O.P.S.O. (overprint): New Zealand, officials for Post Office sent abroad [On Public Service Only].

ORANGE RIVER COLONY (overprint on stamps of Cape of Good Hope): Orange River Colony (1900-2).

ORANJE VRIJ STAAT: Orange River Colony [Orange Free State].

ORCHA: India- Orchha (1913-7).

ORCHHA: India- Orchha (1913-7).

ORDINARY (overprint): Liberia, airmail to regular mail conversion.

ORE (currency) Denmark, Sweden or Norway.

ORGANISATION INTERNACIONALE POUR LES REFUGIES (overprint): Switzerland- Int. Org. for Refugees, officials (1950).

ORGANISATION MONDIALE DE LA SANTE (overprint): Switzerland- World Health Organization, officials.

ORO PASTAS: Lithuania, air mails.

ORPHELINS DE LA GUERRE: France, semipostals [War Orphans].

ORTS-POST: Switzerland (1850).

O.S.: Norway, officials (1951-2) [Offentlig Sax].

O.S.: English language countries, officials [On Service].

O.S.G.S. (overprint): Sudan, officials [On Sudan Government Service].

OSTEN (overprint on stamps of Germany): Poland- German Occupation (1939).

OSTERREICH: Austria.

OSTERREICHISCHE POST: Austria.

OSTERR-POST: Austria.

OSTLAND (overprint on stamps of Germany): Russia- German occupation (1941-3).

O.T. (overprint): Czechoslovakia, newspaper stamps used by commercial firms.

OTVORENIE SLOVENSKENO (overprint on stamps of Czechoslovakia): Slovakia (1939).

OUBANGUI-CHARI: Ubangi.

OUBANGUI-CHARI-TCHAD (overprint on stamps of Middle Congo): Ubangi (1915-24).

O.U.S. (overprint between wavy lines): Great Britain, official overprint for the Oxford Union Society to prevent pilfering of 1d reds.

O.W. OFFICIAL (overprint): Great Britain- Office of Public Works, officials (1896-1902).