- September 2
- The Democratic Republic of Vietnam issues its first postage stamps, using overprinted stamps of French Indo-China. [1135]
- November 4
- Formosa issues its first postage stamps. [1135]
- November
- Java issues its first postage stamps. [1135]
- November 24
- Austria resumes issuing postage stamps. [700.637] [1135]
1946
- February 1
- The Falkland Islands Dependencies issues its first postage stamps. [1135]
- March 12
- First postage stamps are issued for use in northern Korea, occupied by Soviet Union military. [1367.239]
- May 1
- Korea resumes issuance of postage stamps, initially under US Military rule. [1367.180]
- May 15
- Syria joins the Universal Postal Union. [1135]
- May 18
- Sarawak issues its last postage stamps, before being ceded to the British Crown. [278.1017]
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- May 25
- The independent Kingdom of Trans-Jordan issues its first postage stamps. [1135] [1367.121]
- May 28
- The USA issues its last postage stamps for use in the Philippines. [278.241]
- June 19
- The Philippines issues its last postage stamps under US control. [700.202]
- (month unknown)
- Hungary issues the world's highest denominated postage stamps, 500,000 million million (500,000,000,000,000,000) pengo. [1135] [1841.735]
- Last postage stamps for use in Nabha State of India are issued. [1841.925]
- July 4
- The independent Republic of the Philippines issues its first postage stamps. [278.241] [1135]
- July 31
- On last day of hyperinflation in Hungary, a 5-millió adópengö postage stamp costs 10 octillion pengö (10,000,000,000,000,000,000,000,000,000). [977.249]
1947
- April 16
- The United Kingdom issues its first postage stamps for use in Sarawak. [278.1017]
- May 13
- The Byelorussian Soviet Socialist Republic joins the Universal Postal Union. [1135]
- The Ukrainian Soviet Socialist Republic joins the Universal Postal Union. [1135]
- May 16
- Jordan joins the Universal Postal Union. [1135]
- June 2
- France issues last postage stamps for use in French Guiana. [1843.1297]
- France issues last postage stamps for use in the colony of Martinique. [1367.848]
- June 10
- Australia issues first postage stamps for use in Norfolk Island. [1135] [1367.1507]
- June 24
- Newfoundland issues its last regular mail postage stamp, for the 450th anniversary of John Cabot's discovery of Newfoundland. [1135]
- (month unknown)
- Last postage stamps for use in Patiala State of India are issued. [1841.926]
- Indore State of India issues its last postage stamps. [1841.936]
- Bundi State of India issues its last postage stamps. [1841.930]
- Kishangarh State of India issues its last postage stamps. [1841.940]
- France issues first stamps for use in Saar under French administration. [278.767]
- September 1
- North Borneo issues its first postage stamps. [1135]
- October 1
- The Dominion of Pakistan issues its first postage stamps, using overprints of India. [278.1] [1135]
- October 31
- The Kingdom of Romania issues its last postage stamps. [278.489]
- November 1
- Last postage stamps of Kingdom of Trans-Jordan are issued. [1367.121]
- November 10
- Pakistan joins the Universal Postal Union. [1135]
- November 21
- The Dominion of India issues its first postage stamps. [1135]
- December 1
- Bahawalpur state of Pakistan issues its first postage stamps. [278.33] (August 15 [1135])
1948
- January 1
- Cape Juby issues its last postage stamps. [707.115]
- January 6
- Burma issues its first postage stamps as an independent state. [1135]
- January 25
- The People's Republic of Romania issues its first postage stamp. [278.489]
- February 14
- Last day of validity of postage stamps of Morvi State of India. [1841.941]
- Last day of validity of postage stamps of Jasdan State of India. [1841.939]
- April 1
- France issues first postage stamps for use in the French Protectorate of Saar. [278.767]
- Bahawalpur issues its own first postage stamps. [1135]
- May 16
- Israel issues its first postage stamps, depicting coins. [1116.73] [1135] [1841.1126]
- June 22
- First postage stamps are issued for use in Tokelau Islands. [285.546] [1135]
- June 30
- Last day of validity of postage stamps for Barwani State of India [1841.927]
- (month unknown)
- Morvi State of India issues its last postage stamps. [1841.941]
- Last postage stamps for use in Chamba State of India are issued. [1841.921]
- Rajasthan State of India issues its first postage stamps. [1841.942]
- The United Kingdom issues last postage stamps for use in Straits Settlements. [285.216]
- Netherlands issues first postage stamps for use in Indonesia. [1367.1289]
- July 1
- First issue of postage stamps for Ryukyu Islands under US administration. [700.204]
- July 9
- Pakistan issues its first non-overprint postage stamps. [278.1]
- August 1
- The Republic of (South) Korea issues its first postage stamps. [1135]
- September 1
- The United Kingdom issues first postage stamps for use in Singapore. [278.1144] [1135]
- First postage stamps are issued for use in the America, British, and French occupation sectors of Berlin. [1841.175]
- September 19
- The Democratic People's Republic of Korea issues its first postage stamps. [1367.239]
- September 25
- Netherlands issues last postage stamps for use in Netherlands Indies. [1367.1289]
- December 1
- The Malay state of Penang issues its first postage stamps. [1135] [1367.700]
- The Malay state of Perlis issues its first postage stamps. [1135] [1367.703]
- The Malay state of Malacca issues its first postage stamps. [1135] [1367.698]
1949
- June 13
- France issues last stamps for use in Indo-China. [1841.950]
- June 29
- Last day of validity of postage stamps of Travancore State of India. [1841.945]
- (month unknown)
- Newfoundland issues its last postage stamps (postage due). [707.57]
- Last postage stamps for use in Gwalior State of India are issued. [1841.922]
- Bhopal State of India issues its last postage stamps. [1841.929]
- Jaipur State of India issues its last postage stamps. [1841.938]
- Rajasthan State of India issues its last postage stamps. [1841.942]
- Travancore State of India issues its last postage stamps. [1841.945]
- July 1
- United States of Travancore-Cochin issues its first postage stamps. [1135] [1841.945]
- July 13
- Ceylon joins the Universal Postal Union. [1135]
- July 26
- Netherlands issues last postage stamps labelled Curaçao, also first stamps labelled Netherlands Antilles. [1135] [1367.1263]
- August 1
- Jordan (previously Trans-Jordan) issues its first postage stamps. [1367.21]
- August 15
- Final postage stamps of the Allied occupation of Germany are issued. [1841.157]
- September 7
- The Federal Republic of Germany issues its first postage stamps. [1135] [1841.102]
- October 4
- Burma joins the Universal Postal Union. [1135]
- October 8
- The People's Republic of China issues its first postage stamps. [707.332] [1135]
- October 9
- Spanish West Africa issues its first postage stamps. [1135]
- The German Democratic Republic issues its first postage stamps. [1135]
- October 10
- Bahawalpur state of Pakistan issues its last postage stamps. [278.33]
- October
- Spain issues first postage stamps for use in Spanish West Africa. [285.188]
- December 24
- Israel joins the Universal Postal Union. [1135]
1950
- January 1
- The Republic of China issues its first postage stamps. [1135]
- January 16
- The autonomous state of Cyrenaica issues its first and last postage stamps. [707.705] [1135]
- January 17
- The United States of Indonesia issues its first postage stamps. [1135]
- January 26
- The Republic of India issues its first postage stamps. [1135] [1841.856]
- March 24
- Italy issues first postage stamps for use in Somalia. [285.17] [1135]
- March 31
- Last day of validity of postage stamps of Rajasthan State of India. [1841.942]
- May 15
- Comoro Islands issues its first postage stamps. [707.473] [1135]
- June 5
- Spain issues last postage stamps for use in Spanish West Africa. [285.188]
- (month unknown)
- Cochin State of India issues its last postage stamps. [1841.933]
- Hyderabad State of India issues its last postage stamps. [1841.936]
- Saurashtra State of India issues its last postage stamps. [1841.944]
- Netherlands issues first postage stamps for use in Netherlands New Guinea, depicting Queen Juliana. [1367.1292]
- August 17
- The Republic of Indonesia issues its first postage stamps. [1135]
- November 16
- United Nations gets US government approval to issue postage stamps. [1]
- December 15
- The People's Republic of Albania issues its first postage stamps. [1135]
- December 17
- The US Treasury Department bans the purchase and import of North Korea stamps. [1135]
1951
- February 16
- The United Kingdom issues last postage stamps for Saint Kitts-Nevis. [287.797]
- June 6
- Viet Nam issues its first postage stamps. [285.978]
- (month unknown)
- Cambodia issues its first postage stamps. [707.1]
- Travancore-Cochin State of India issues its last postage stamps. [1841.946]
- August 17
- Vietnam issues its first postage stamps. [1135]
- October 21
- South Vietnam joins the Universal Postal Union. [1135]
- October 24
- United Nations Postal Administration issues its first postage stamps. [1] [700.211] [834.8]
- November 13
- The Kingdom of Laos issues its first postage stamps. [1135]
- November
- The Kingdom of Cambodia issues its first postage stamps. [1135]
- December 21
- Kampuchea/Cambodia joins the Universal Postal Union. [1135]
- December 24
- The Kingdom of Libya issues its first postage stamps, using overprinted stamps of Cyrenaica. [1135] [1367.501]
1952
- January 1
- The United Kingdom issues first postage stamps for use in Tristan da Cunha, overprints of Saint Helena. [285.598] [1135] (February 1 [1166.230])
- February 6
- England replaces King George VI stamp series with Queen Elizabeth II. [1]
- April 15
- Libya issues its first specifically-made postage stamps. [1367.501]
- May 20
- Laos joins the Universal Postal Union. [1135]
- June 4
- Libya joins the Universal Postal Union. [1135]
- June 14
- First joint issue of postage stamps for Saint Christopher, Nevis, and Anguilla. [287.797] [1135]
- October 30
- Australia issues first postage stamps for the Territory of Papua and New Guinea. [278.93] [1135]
- November 21
- First US postage stamp in two colors (rotary process) introduced. [1]
1953
- June 2
- The United Kingdom issues first non-overprinted postage stamps for use in Tristan da Cunha, 3-penny denomination for the coronation of Queen Elizabeth II. [285.598] [1166.230]
1954
- February 22
- Leeward Islands issues its last postage stamps. [1367.446]
- March 1
- Gold Coast issues its last postage stamps. [1841.303]
- June 6
- France issues last postage stamps for use in French India. [1843.1302]
- June 15
- Viet Nam issues its last postage stamps as an Associated State of the French Union. [285.978]
- July 1
- First joint issue of postage stamps inscribed "Rhodesia and Nyasaland", for use in Northern Rhodesia, Southern Rhodesia, and Nyasaland Protectorate. [278.475] [1135]
1955
- January 1
- Bhutan issues its first postage stamps. [1]
- July 20
- The Republic of Viet Nam issues its first postage stamps. [285.978] (1954 [1135])
- July 25
- France issues last postage stamps for use in the French Protectorate of French Morocco. [1843.1308]
- France issues last postage stamps for use in Tunisia. [285.611]
- August 1
- Last postage stamps of the British Crown Colony of Cyprus. [707.686]
- August 16
- The Republic of Cyprus issues its first postage stamps. [707.686]
- September 1
- Qu'aiti State in Hadhramaut issues its first postage stamps. [1135]
- October 12
- Monaco joins the Universal Postal Union. [1135]
- October 28
- France issues first postage stamps for use in the French Southern and Antarctic Islands, using overprint of Madagascar. [1135] [1843.1337]
- November 8
- Spain issues last postage stamps for use in Spanish Morocco. [285.180]
- December 7
- The Dominion of Pakistan issues its last postage stamps. [278.1]
1956
- January 2
- The United Kingdom issues last postage stamps for use in Sierra Leone. [278.1104]
- March 1
- The independent Kingdom of Tunisia issues its first postage stamps. [285.611] [1135]
- March 23
- The Islamic Republic of Pakistan issues its first postage stamps. [278.1]
- April 7
- Spanish Morocco ceases issuance of postage stamps. [1135]
- April 25
- France issues first non-overprint postage stamps for use in the French Southern and Antarctic Islands. [1843.1337]
- May 6
- France issues last postage stamps for use in the French Protectorate of Saar. [278.769]
- (month unknown)
- Last stamps of Cameroun under French mandate are issued. [707.29]
- July 1
- Stamps of the Leeward Islands become invalid. [1135]
- July 27
- Sudan joins the Universal Postal Union. [1135]
- August 17
- Newly independent Kingdom of Morocco resumes issuing its own postage stamps (last were in 1913). [1135] [1367.1121]
- August 23
- The Kingdom of Morocco issues its first postage stamps in Spanish currency. [1135]
- October 11
- Nepal joins the Universal Postal Union. [1135]
- October 15
- Morocco joins the Universal Postal Union. [1135]
- November 1
- Tunisia joins the Universal Postal Union. [1135]
- December 14
- Laos issues its first postage stamps as an independent state. [1135]
1957
- January 11
- New Zealand issues first postage stamps for the Ross Dependency. [1135] [1367.1397]
- March 6
- Ghana issues its first postage stamps. [1135] [1841.245]
- March 12
- Last postage stamps of Madagascar (continuing as Malagasy Republic). [1367.651]
- March 27
- The Australian Antarctic Territory issues its first postage stamps. [700.630] [1135]
- April 1
- The United Kingdom issues first postage stamps for use in Qatar, overprints of UK stamps. [278.457] [1135]
- Germany begins issuing postage stamps for use in the Saar. [278.769]
- May 5
- Federation of Malaya issues its first postage stamps. [1135] [1367.693]
- June 8
- The independent Republic of Togo issues its first postage stamps. [285.508] [1135]
- July 5
- The kingdom of Tunisia issues its last postage stamps. [285.611]
- July 15
- Ecuador issues first postage stamps for use in the Galapagos Islands. [1135] [1843.956]
- August 8
- The republic of Tunisia issues its first postage stamps (previously was a kingdom). [285.611] [1135]
- October 10
- Ghana joins the Universal Postal Union. [1135]
- November
- The British post office begins experiments with automatic electronic sorting, facing, and cancelling mail. Vertical graphite lines are applied on the backs under the gum of definitive issues in 1/2- through 4 1/2-penny denominations. The stamp on an envelope can then be detected by use of an electrical charge. [1091.18]
- November 19
- Great Britain introduces postage stamps with graphite lines on backs as part of an automatic mail sorting experiment, in Southampton. [1135]
1958
- January 17
- Malaysia joins the Universal Postal Union. [1135]
- February 12
- The United Arab Republic issues its first postage stamps. [1135]
- March 21
- The USA issues its last postage stamps for use in Western Samoa. [278.969]
- March 22
- Egypt issues its first United Arab Republic postage stamps. [1843.964]
- (month unknown)
- Independent state of Cameroun issues first postage stamps. [707.29]
- August 18
- Great Britain post office issues first regional postage stamps (Bailiwick of Guernsey, Isle of Man, Jersey, Northern Ireland, Scotland, Principality of Wales). [1] [834.22] [1135]
- October 15
- First postage stamps issued for Christmas Island, using stamps of Australia overprinted with name and value. [707.404] [1135] [1152.1200]
- November 3
- French Polynesia issues its first postage stamps. [1135]
- December 10
- France issues last postage stamps for use in French Equatorial Africa. [1843.1293]
- Malagasy Republic issues its first postage stamps. [1135] [1367.651]
1959
- January 3
- Ecuador issues last postage stamps for use in the Galapagos Islands. [1843.957]
- January 5
- Republic of Guinea issues its first postage stamps, overprints of French West Africa stamps. [1135] [1841.571]
- February 1
- Britain issues first postage stamps made specifically for use in Kuwait. [1367.348]
- March 21
- France issues last postage stamps for use in French West Africa. [1843.1357]
- May 6
- Germany issues last postage stamps for use specifically in Saar. [278.769]
- People's Republic of Guinea joins the Universal Postal Union. [1135]
- June 1
- Spain issues last postage stamps for use in Spanish Guinea. [285.175]
- June
- The British post office abandons use of graphite lines on backs of stamps for automatic electronic sorting. [1091.18]
- (month unknown)
- Upper Volta, now a republic, resumes issuing postage stamps. [700.1239]
- Republic of Chad issues its first postage stamps. [707.185]
- Republic of Congo issues first postage stamps. [707.497]
- July 30
- Frederick H. Douglas of New Jersey sells at John A. Fox auction a USA 1918 24-cent Jenny invert airmail postage stamp, mint never hinged, for $6100 to Raymond H. Weill, acting as agent for J. A. Graves. [1220.76]
- October 1
- Republic of Ivory Coast issues its first postage stamps. [1135] [1841.1257]
- November 7
- Mali Federation issues its first postage stamps. [1135] [1367.769]
- November 17
- Kingdom of Morocco issues its first postage stamps for use throughout kingdom. [1135]
- November 18
- Great Britain issues stamps with phosphor bands as part of automatic sorting procedure. [1135]
- November 28
- The Gabon Republic issues its first postage stamps, 15fr and 25fr depicting Prime Minister Leon Mba. [1841.2]
- Congo Republic issues its first postage stamps. [1135]
- December 1
- Central African Republic issues its first postage stamps. [707.142] [1135]
- December 10
- Republic of Upper Volta issues its first postage stamps. [1135]
- December 18
- Republic of Niger issues its first postage stamps. [1135] [1367.1450]
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