| Record Number | Keyword(s) | Country | Catalog Listed? | Continent | |
| 1487 | M (overprint) | Belgium, military parcel posts. | Real | Europe |  |
| 1488 | M. (overprint) | South Australia, officials (1868-74) [Military]. | Real | Australia | |
| 1489 | M. B. (overprint) | South Australia, officials (1868-74) [Marine Board]. | Real | Australia | |
| 1490 | M. KIR. | Hungary (1916). | Real | Europe | |
| 1491 | M. R. (overprint) | South Australia, officials (1868-74) [Manager of Railways]. | Real | Australia | |
| 1492 | M. R. G. (overprint) | South Australia, officials (1868-74) [Main Roads Gambierton]. | Real | Australia | |
| 1493 | M.A. (overprint) | Argentina, officials [Ministry of Agriculture]. | Real | Americas |  |
| 1494 | M.A.L. | cancel of British Forces in North and East Africa [Military Authority Lira]. | Real | Africa | |
| 1495 | M.B.D. (overprint) | India- Nandgaon, officials (1893-5). | Real | Asia | |
| 1496 | M.E.F. (overprint on stamps of Great Britain) | Great Britain- Offices in Africa (1942-50) [Middle East Forces]. | Real | Africa |  |
| 1497 | M.G. (overprint) | Argentina, officials [Ministry of War]. | Real | Americas | |
| 1498 | M.H. (overprint) | Argentina, officials [Ministry of Finance]. | Real | Americas | |
| 1499 | M.I. (overprint) | Argentina, officials [Ministry of Interior]. | Real | Americas | |
| 1500 | M.J.I. (overprint) | Argentina, officials [Ministry of Justice and Education]. | Real | Americas | |
| 1501 | M.M. (overprint) | Argentina, officials [Ministry of Marine]. | Real | Americas | |
| 1502 | M.O.P. (overprint) | Argentina, officials [Ministry of Public Works]. | Real | Americas | |
| 1503 | M.R.C. (overprint) | Argentina, officials [Ministry of Foreign Affairs and Religion]. | Real | Americas | |
| 1504 | M.V.i.R. (overprint) | Romania- German occupation (1917-8) [Militar Verwaltung in Rumanien (Military Administration of Romania]. | Real | Europe | |
| 1505 | MACAU | Macao. | Real | Asia |  |
| 1506 | MACAV | Macao. | Real | Asia |  |
| 1507 | MACEDONIA | Jugoslavia. | Not Scott Listed | Europe | |
| 1508 | MACTAN ISLAND | Bogus stamps and overprints for Philippine island south of Cebu. | Not Scott Listed | Asia | |
| 1509 | MADAGASCAR (overprint on stamps of France) | Madagascar (1895). | Real | Africa |  |
| 1510 | MADEIRA (overprint on stamps of Portugal) | Madeira (1868-98). | Real | Europe |  |
| 1511 | MADERANERTHAL | Switzerland, hotel local stamp. | Real | Europe |  |
| 1512 | MADMAN STATE | India, parody of Wadwan State. | Not Scott Listed | Asia | |
| 1513 | MADRID | Spain (1920-30). | Real | Europe |  |
| 1514 | MAESTRAL | Jugoslavia. | Not Scott Listed | Europe | |
| 1515 | MAFEKING (overprint on stamps of Bechuanaland) | Cape of Good Hope (1900). | Real | Africa |  |
| 1516 | MAFEKING (overprint) | Cape of Good Hope (1900). | Real | Africa |  |
| 1517 | MAFIA ISLAND | German warship had to hide in Rufiji River and sailors stayed so long that local officials issued "stamps" for them as currency. | Not Scott Listed | Africa |  |
| 1518 | MAGAZON A MOROC | Sultanate of Morocco, local issue of questionable repute (1891) [Mazagan to Morocco]. | Real | Africa | |
| 1519 | MAGAZON MARAKECH | Sultanate of Morocco, local issue of questionable repute (1893) [Mazagan to Marakesh]. | Real | Africa | |
| 1520 | MAGDALENA | Colombian State bogus issue of 1878. | Not Scott Listed | Americas | |
| 1521 | MAGYAR | Hungary. | Real | Europe |  |
| 1522 | MAGYAR KIR. HIRLAP BELYEG | Hungary, newspaper tax stamps. | Real | Europe |  |
| 1523 | MAGYAR KIR(ALYN) POSTA | Hungary [Hungarian Royal Post]. | Real | Europe |  |
| 1524 | MAGYAR NEMZETI KORMANY SZEGED (overprint) | Hungary- Szeged- Serbian occupation (1919) [Hungarian People’s Government Szeged]. | Real | Europe |  |
| 1525 | MAGYAR NEPKOZTARSASAG | Hungary (1919) [People’s Popular Republic]. | Real | Europe |  |
| 1526 | MAGYAR TANACS KOZTARSASAG | Hungary (1919) [Hungarian Soviet Republic]. | Real | Europe | |
| 1527 | MAGYARORSZAG | Hungary (1925) [Hungarian State]. | Real | Europe |  |
| 1528 | MAHRA SULTANATE OF QISHN AND SOCOTRA | South Arabia (1967). | Real | Asia |  |
| 1529 | MAI GT. PRE. 1902 (overprint) | Haiti (1902) [Gouvernement Provisoire (Provisional Government)]. | Real | Americas |  |
| 1530 | MALACCA | Malaya- Malacca. | Real | Asia |  |
| 1531 | MALAGA (overprint) | Spain revolutionary issues- Malaga (1937). | Real | Europe |  |
| 1532 | MALAGA ARRIBA ESPANA (overprint) | Spain- Malaga, revenues. | Real | Europe |  |
| 1533 | MALAGASY | Madagascar (1961-present). | Real | Africa |  |
| 1534 | MALAKOTE | German East Africa unissued stamps. | Not Scott Listed | Africa |  |
| 1535 | MALAYA (overprint over picture of mosque) | Selangor. | Real | Asia | |
| 1536 | MALAYA (overprint over picture of over picture of State Arms) | Negri Sembilan. | Real | Asia | |
| 1537 | MALAYA (overprint over portrait of Sultan) | Malaya- Kelantan, Negri Sembilan, Pahang, Perak, Perlis, Selanegor or Trengganu. | Real | Asia | |
| 1538 | MALAYA PERLIS | Malaya- Perlis. | Real | Asia |  |
| 1539 | MALAYA SINGAPORE | Singapore. | Real | Asia |  |
| 1540 | MALAYAN POSTAL UNION | Malaya, postage dues (1945). | Real | Asia |  |
| 1541 | MALDIVES (overprint on stamps of Ceylon) | Maldives Islands(1906-9). | Real | Asia |  |
| 1542 | MALGACHE | Madagascar (1959-61). | Real | Africa |  |
| 1543 | MALMEDY (overprint on stamps of Belgium) | Germany- Belgian occupation of Melmedy (1920-1). | Real | Europe |  |
| 1544 | MALUKA SELATAN | South Moloccas (Indonesian private issues). | Real | Asia |  |
| 1545 | MANAMA | Ajman- Manama. | Real | Asia |  |
| 1546 | MANDAT | Netherlands, money order stamps (1894). | Real | Europe | |
| 1547 | MANGALIA | Romania revenue issue that has long been regarded as bogus. | Not Scott Listed | Europe |  |
| 1548 | MANGIARE, LO STATO DI | | Not Scott Listed | none |  |
| 1549 | MANIZALES | Colombia- Manizales. | Real | Americas |  |
| 1550 | MANIZALES | Colombian city with labels printed during the 19th century as a private local post. | Not Scott Listed | Americas |  |
| 1551 | MANUMBALAND | Bogus stamps created for newspaper columnist. | Not Scott Listed | none | |
| 1552 | MAPKA | Russia, Finland or Serbia. | Real | Europe |  |
| 1553 | MARCA DA BOLLO | Italy. | Real | Europe |  |
| 1554 | MARI, MARI-EL | Bogus Russian local overprint. | Not Scott Listed | Asia |  |
| 1555 | MARIANAS ESPANOL (overprint on stamps of Spain) | Mariana Islands (1899). | Real | Asia |  |
| 1556 | MARIANEN | Mariana Islands (1899-1919). | Real | Asia |  |
| 1557 | MARIENWERDER (overprint on stamps of Germany) | Marienwerder plebescite (1920). | Real | Europe |  |
| 1558 | MARK (currency) | Finland, Germany. | Real | Europe |  |
| 1559 | MARKA (currency) | Estonia (1919-28), Russia. | Real | Europe |  |
| 1560 | MARKAA (currency) | Finland. | Real | Europe |  |
| 1561 | MARKKA (currency) | Finland. | Real | Europe |  |
| 1562 | MAROC | French Morocco, Morocco. | Real | Africa |  |
| 1563 | MAROCCO (overprint on stamps of Germany) | Germany- Offices in Morocco. | Real | Africa |  |
| 1564 | MAROKKO (overprint on stamps of Germany) | Germany- Offices in Morocco (1911). | Real | Africa |  |
| 1565 | MARRUECOS | Morocco- Northern Zone (1956-8). | Real | Africa |  |
| 1566 | MARRUECOS (overprint on stamps of Spain) | Spanish Morocco. | Real | Africa | |
| 1567 | MARRUECOS ESPANOL | Spanish Morocco- Northern Zone. | Real | Africa |  |
| 1568 | MARSCHELL INSELN | Marshall Islands. | Real | Asia | |
| 1569 | MARSHALL INSELN | Marshall lslands. | Real | Asia |  |
| 1570 | MARTINIQUE (overprint on stamps of French Colonies) | Martinique (1886-92). | Real | Africa |  |
| 1571 | MAT TUAN D.T.G.P. MIEN NAM VIET NAM | National Front for the liberation of South Vietnam. | Real | Asia |  |
| 1572 | MAURITANIE | Mauritania. | Real | Africa |  |
| 1573 | MAZATLAN (overprint) | Mexico- Mazatlan (1916). | Real | Americas |  |
| 1574 | MBLEDHJA KUSHTETUGESE (overprint on stamps of Italy) | Albania- Italian dominion (1939). | Real | Europe |  |
| 1575 | MBRETNIJA SHQIPTARE | Albania- Italian occupation. | Real | Europe |  |
| 1576 | McCOY | Fantasy issue for bogus island in Pacific. | Not Scott Listed | none | |
| 1577 | McDONALD TERRITORY | County in Missouri that seceded from state. | Not Scott Listed | Americas |  |
| 1578 | MECKLENB. | German States- Mecklenburg-Schwerin (1856-67). | Real | Europe | |
| 1579 | MEDELLIN PROVISIONAL | Colombia- Antioquia (1888-9). | Real | Americas |  |
| 1580 | MEDIA ONZA | Spain, official stamps (1854-63). | Real | Europe |  |
| 1581 | MEJICO | Mexico (1856-64). | Real | Americas | |
| 1582 | MEKKA | Bogus issue for Mecca. | Not Scott Listed | Asia | |
| 1583 | MELAKA | Malaysia- Malacca. | Real | Asia |  |
| 1584 | MELAT-I-KAZERUN 1335 (overprint) | Iran, unofficial rebellion overprint (1917). | Real | Asia | |
| 1585 | MEMEL (overprint on stamps of France) | Memel (1920-3). | Real | Europe |  |
| 1586 | MEMEL GEBIET | Memel [Memel District]. | Real | Europe | |
| 1587 | MEMEL with KLAIPEDA | Memel- Lithuanian occupation (1923). | Real | Europe |  |
| 1588 | MENDOCINO, STATE OF | Proposed secessionist issue for Northern California. | Not Scott Listed | Americas | |
| 1589 | MENSAJERIAS | Uruguay, special delivery stamps. | Real | Americas |  |
| 1590 | METELIN (overprint on stamps of Russia) | Russia- Offices in Turkey (1910). | Real | Asia |  |
| 1591 | MEVU | Antarctic fantasy. | Not Scott Listed | None | |
| 1592 | MEXICANO | Mexico. | Real | Americas |  |
| 1593 | MEXICO TRANSITORIO | Mexico- Sonora revenues. | Real | Americas |  |
| 1594 | MILESIMA DE ESCUDO (currency) | Spain. | Real | Europe |  |
| 1595 | MILESIMA DE PESO (currency) | Spanish Colonies. | Real | Europe | |
| 1596 | MILESIMO (currency) | Uruguay. | Real | Americas | |
| 1597 | MILIT. (POST) PORTOMARKE | Bosnia and Herzegovina, military post postage dues.. | Real | Europe |  |
| 1598 | MILITAR K.u.K. POST | Bosnia and Herzegovina- Austrian Administration (1912). | Real | Europe |  |
| 1599 | MILITAR POST EILMARKE | Bosnia and Herzegovina, special handling stamps. | Real | Europe |  |
| 1600 | MILITARPOST | Bosnia and Herzegovina. | Real | Europe |  |
| 1601 | MILL. (currency surcharge on stamps of France) | France- Offices in Egypt (1921-8). | Real | Africa |  |
| 1602 | MILLIEME(S) (currency surcharge on stamps of France) | France- Offices in Egypt (1921-8). | Real | Africa |  |
| 1603 | MINAUE | Antarctic fantasy. | Not Scott Listed | None | |
| 1604 | MINNESOTA REPUBLIC | No Information Available. | Not Scott Listed | Americas | |
| 1605 | MlNERVA, REPUBLIC OF | Reefs near Tonga. | Not Scott Listed | Australia | |
| 1606 | MN | Korea (1884-95). | Real | Asia | |
| 1607 | MOCAMBIQUE | Mozambique. | Real | Africa |  |
| 1608 | MOGADORO A MAROC | Sultanate of Morocco, local issue of questionable repute (1895) [Mogadoro to Morocco]. | Real | Africa |  |
| 1609 | MOHΓOЛ ЩЧAAH | Outer Mongolia. | Real | Asia |  |
| 1610 | MONGTSEU (overprint on stamps of Indo-China) | France- Offices in China- Mongtseu (1903-9). | Real | Asia |  |
| 1611 | MONGTZE (overprint on stamps of Indo-China) | France- Offices in China- Mongtseu (1903-9). | Real | Asia |  |
| 1612 | MONISTIR (overprint on stamps of Turkey) | Turkey, for royal visit of Sultan to Rumelia (1911) [City of Monistir]. | Real | Asia | |
| 1613 | MONROVIA | Liberia. | Real | Africa |  |
| 1614 | MONSTER (overprint) | Dutch language countries [Specimen]. | Real | Europe | |
| 1615 | MONT ATHOS (overprint on stamps of Russia) | Russia- Offices in Turkey- Mont Athos (1909-10). | Real | Asia |  |
| 1616 | MONTE BELLO ISLAND | Australian island bogus issue. | Not Scott Listed | Australia |  |
| 1617 | MONTE CASSINO 1944 (overprint on stamps of Poland-Exile in Great Britain) | Polish government in exile (1944). | Real | Europe |  |
| 1618 | MONTENEGRO (overprint on stamps of Austria) | Montenegro- Austrian occupation (1917-8). | Real | Europe |  |
| 1619 | MONTENEGRO (overprint on stamps of Italy) | Montenegro- Italian occupation (1941-2). | Real | Europe |  |
| 1620 | MONTEREY (overprint) | Mexico- Monterey. | Real | Americas | |
| 1621 | MONTERREY | Mexican city with local stamps of the 1860's considered bogus. | Not Scott Listed | Americas | |
| 1622 | MONTEVIDEO | Uruguay- Montevideo (1858-67). | Real | Americas | |
| 1623 | MONTSERRAT (overprint on stamps of Antigua) | Montserrat (1876). | Real | Americas |  |
| 1624 | MOON ISLAND | Norway local post. | Not Scott Listed | Europe | |
| 1625 | MOQUEA (overprint) | Peru- Moquegua- Chilean occupation (1885). | Real | Americas | |
| 1626 | MOQUEGUA (overprint on stamps of Arequipa) | Peru- Arequipa- Moquegua- Chilean occupation (1885). | Real | Americas | |
| 1627 | MOQUEGUA (overprint) | Peru- Moquegua, applied after regional earthquake (1881). | Real | Americas |  |
| 1628 | MORA | Ukraine. | Real | Europe | |
| 1629 | MORDAVIA | Bogus Russian local overprint. | Not Scott Listed | Europe | |
| 1630 | MORELIA | Mexican city with local stamps of the l9th century considered bogus. | Not Scott Listed | Americas |  |
| 1631 | MORELIA (overprint) | Mexico- Morelia. | Real | Americas |  |
| 1632 | MORESNET | Neutral territory between Germany and Belgium issued by Moens in 1867, local issue made in 1886. | Not Scott Listed | Europe |  |
| 1633 | MOROKULIEN | Territory in Norway bordering Sweden. Moro means joy in Swedish and Kulien means joy in Norwegian. Children's issue. Now a campground and customs station. | Not Scott Listed | Europe | |
| 1634 | MORROCCO AGENCIES (overprint on stamps of Gibraltar) | Great Britain- Offices in Morocco. | Real | Africa |  |
| 1635 | MORROCCO AGENCIES (overprint on stamps of Great Britain) | Great Britain- Offices in Morocco. | Real | Africa |  |
| 1636 | MORVI | India- Morvi (1931-48). | Real | Asia | |
| 1637 | MOUNT ATHOS | Turkish stamps overprinted for use as local stamps. | Not Scott Listed | Asia |  |
| 1638 | MOYEN CONGO | Middle Congo. | Real | Africa | |
| 1639 | MQE (overprint on stamps of French Colonies) | Martinique (1886-91). | Real | Africa |  |
| 1640 | MUESTRA (overprint) | Spanish language countries [Specimen]. | Real | Europe |  |
| 1641 | MUK, ISLAND OF | Bogus Scotland island stamp. | Not Scott Listed | Europe | |
| 1642 | MULTA | several countries, postage dues [Fined]. | Real | Europe |  |
| 1643 | MULTADA | Chile, postage dues[Fined]. | Real | Americas |  |
| 1644 | MULTAS | Ecuador, postage dues[Fined]. | Real | Americas |  |
| 1645 | MUSCAT & OMAN | Oman (1966-70). | Real | Asia |  |
| 1646 | MUSTER (overprint) | German language countries [Specimen]. | Real | Europe | |
| 1647 | MY BONNIE | Donald Evans issue, New York. | Not Scott Listed | none | |
| 3642 | Macao | Macao (stamp issuing country) 1884 - | Real | Asia |  |
| 3643 | Macedonia | Macedonia (stamp issuing country) 1991 - | Real | Europe |  |
| 3644 | Macedonia (German Occupation) | Macedonia (German Occupation) (stamp issuing country) 1944 - only | Real | Europe |  |
| 3645 | Madagascar (British Consular Mail) | Madagascar (British Consular Mail) (stamp issuing country) 1884 - 1895 | Real | Africa |  |
| 3646 | Madagascar (French Post Offices) | Madagascar (French Post Offices) (stamp issuing country) 1885 - 1896 | Real | Africa |  |
| 3647 | Madagascar and Dependencies | Madagascar and Dependencies (stamp issuing country) 1896 - 1958 | Real | Africa |  |
| 3648 | Madeira | Madeira (stamp issuing country) 1868 - | Real | Europe |  |
| 3649 | Mafeking | Mafeking (stamp issuing country) 1900 - only | Real | Africa |  |
| 3651 | Mafia Island (British Occupation) | Mafia Island (British Occupation) (stamp issuing country) 1915 - 1916 | Real | Africa |  |
| 3652 | Mahra Sultanate of Qishn and Socotra | Mahra Sultanate of Qishn and Socotra (stamp issuing country) 1967 - only | Real | Asia |  |
| 3653 | Majunga (French Post Office) | Majunga (French Post Office) (stamp issuing country) 1895 - only | Real | Europe | |
| 3654 | Malacca | Malacca (stamp issuing country) 1948 - | Real | Asia |  |
| 3655 | Malagasy Republic | Malagasy Republic (stamp issuing country) 1958 - | Real | Africa |  |
| 3656 | Malawi | Malawi (stamp issuing country) 1964 - | Real | Africa |  |
| 3657 | Malaya (British Military Administration) | Malaya (British Military Administration) (stamp issuing country) 1945 - 1948 | Real | Asia |  |
| 3658 | Malaya (Japanese Occupation) 日本国 | Malaya (Japanese Occupation) (stamp issuing country) 1942 - 1945 | Real | Asia |  |
| 3659 | Malaya (Thai Occupation) | Malaya (Thai Occupation) (stamp issuing country) 1943 - 1945 | Real | Asia |  |
| 3660 | Malayan Federation | Malayan Federation (stamp issuing country) 1957 - 1963 | Real | Asia |  |
| 3662 | Malayan Postal Union | Malayan Postal Union (stamp issuing country) 1936 - 1968 | Real | Asia |  |
| 3663 | Malaysia | Malaysia (stamp issuing country) 1963 - | Real | Asia |  |
| 3664 | Malaysia Federal Territory | Malaysia Federal Territory (stamp issuing country) 1979 - | Real | Asia |  |
| 3665 | Maldive Islands | Maldive Islands (stamp issuing country) 1906 - | Real | Asia |  |
| 3666 | Mali | Mali (stamp issuing country) 1960 - | Real | Africa |  |
| 3667 | Mali Federation | Mali Federation (stamp issuing country) 1959 - 1960 | Real | Africa |  |
| 3668 | Malta | Malta (stamp issuing country) 1860 - | Real | Europe |  |
| 3669 | Manchukuo 滿洲國 満州国 | Manchukuo (stamp issuing country) 1932 - 1945 | Real | Asia |  |
| 3670 | Manchuria | Manchuria (stamp issuing country) 1927 - 1928 | Real | Asia |  |
| 3671 | Mariana Islands (Marianen) | Mariana Islands (Marianen) (stamp issuing country) 1899 - 1914 | Real | Asia |  |
| 3673 | Marienwerder | Marienwerder (stamp issuing country) 1920 - only | Real | Europe |  |
| 3674 | Marshall Islands | Marshall Islands (stamp issuing country) 1984 - | Real | Asia |  |
| 3675 | Marshall Islands (German Colony) | Marshall Islands (German Colony) (stamp issuing country) 1897 - 1916 | Real | Asia |  |
| 3676 | Martinique | Martinique (stamp issuing country) 1886 - 1947 | Real | Americas |  |
| 3677 | Mauritania | Mauritania (stamp issuing country) 1960 - | Real | Africa |  |
| 3678 | Mauritania (French Colony) | Mauritania (French Colony) (stamp issuing country) 1906 - 1944 | Real | Africa |  |
| 3679 | Mauritius | Mauritius (stamp issuing country) 1847 - | Real | Africa |  |
| 3680 | Mayotte | Mayotte (stamp issuing country) 1892 - 1914 | Real | Africa |  |
| 3681 | Mecklenburg-Schwerin | Mecklenburg-Schwerin (stamp issuing country) 1856 - 1868 | Real | Europe |  |
| 3682 | Mecklenburg-Strelitz | Mecklenburg-Strelitz (stamp issuing country) 1864 - 1868 | Real | Europe |  |
| 3684 | Memel (French Administration) | Memel (French Administration) (stamp issuing country) 1920 - 1923 | Real | Europe |  |
| 3685 | Mengkiang (Japanese Occupation) | Mengkiang (Japanese Occupation) (stamp issuing country) 1942 - 1945 | Real | Asia |  |
| 3686 | Mérida | Mérida (stamp issuing country) 1916 - only | Real | Americas | |
| 3687 | Mesopotamia | Mesopotamia (stamp issuing country) 1917 - 1922 | Real | Europe |  |
| 3688 | Mexico | Mexico (stamp issuing country) 1856 - | Real | Americas |  |
| 3689 | Micronesia | Micronesia (stamp issuing country) 1984 - | Real | Asia |  |
| 3690 | Middle Congo | Middle Congo (stamp issuing country) 1907 - 1937 | Real | Africa |  |
| 3691 | Middle East Forces (MEF) | Middle East Forces (MEF) (stamp issuing country) 1942 - 1947 | Real | Asia |  |
| 3692 | Modena | Modena (stamp issuing country) 1852 - 1860 | Real | Europe |  |
| 3693 | Moheli | Moheli (stamp issuing country) 1906 - 1914 | Real | Asia |  |
| 3696 | Moldavia | Moldavia (stamp issuing country) 1858 - 1862 | Real | Europe |  |
| 3697 | Moldova | Moldova (stamp issuing country) 1991 - | Real | Europe |  |
| 3698 | Moldo-Wallachia | Moldo-Wallachia (stamp issuing country) 1862 - 1865 | Real | Europe | |
| 3699 | Monaco | Monaco (stamp issuing country) 1885 - | Real | Europe |  |
| 3700 | Mongolia | Mongolia (stamp issuing country) 1924 - | Real | Asia |  |
| 3701 | MongTseu (IndoChinese Post Office) | MongTseu (IndoChinese Post Office) (stamp issuing country) 1903 - 1922 | Real | Asia |  |
| 3702 | Montenegro (Austrian Occupation) | Montenegro (Austrian Occupation) (stamp issuing country) 1917 - only | Real | Europe |  |
| 3703 | Montenegro (German Occupation) | Montenegro (German Occupation) (stamp issuing country) 1943 - 1945 | Real | Europe |  |
| 3704 | Montenegro (Italian Occupation) | Montenegro (Italian Occupation) (stamp issuing country) 1941 - 1943 | Real | Europe |  |
| 3706 | Montenegro (Yugoslav Regional Issues) | Montenegro (Yugoslav Regional Issues) (stamp issuing country) 1945 - only | Real | Europe |  |
| 3707 | Montserrat | Montserrat (stamp issuing country) 1876 - | Real | Americas |  |
| 3708 | Morocco | Morocco (stamp issuing country) 1956 - | Real | Africa |  |
| 3709 | Morocco (French Post Offices) | Morocco (French Post Offices) (stamp issuing country) 1862 - 1914 | Real | Africa |  |
| 3710 | Morocco (German Post Offices) | Morocco (German Post Offices) (stamp issuing country) 1899 - 1917 | Real | Africa |  |
| 3711 | Morocco (Spanish Post Offices) | Morocco (Spanish Post Offices) (stamp issuing country) 1903 - 1914 | Real | Africa |  |
| 3712 | Morocco Agencies | Morocco Agencies (stamp issuing country) 1898 - 1957 | Real | Africa |  |
| 3713 | Morvi | Morvi (stamp issuing country) 1931 - 1948 | Real | Asia |  |
| 3714 | Mosul (Indian Forces) | Mosul (Indian Forces) (stamp issuing country) 1919 - only | Real | Asia |  |
| 3715 | Mount Athos (Russian Post Office) | Mount Athos (Russian Post Office) (stamp issuing country) 1909 - 1914 | Real | Europe |  |
| 3717 | Mozambique | Mozambique (stamp issuing country) 1876 - | Real | Africa |  |
| 3718 | Mozambique Company | Mozambique Company (stamp issuing country) 1892 - 1942 | Real | Africa |  |
| 3719 | Muscat | Muscat (stamp issuing country) 1944 - 1948 | Real | Asia |  |
| 3720 | Muscat and Oman | Muscat and Oman (stamp issuing country) 1966 - 1970 | Real | Asia |  |
| 3721 | Mytilene (Russian Post Office) | Mytilene (Russian Post Office) (stamp issuing country) 1909 - 1914 | Real | Asia |  |