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This is a survey of the postage stamps and postal history of Sri Lanka, formerly known as Ceylon . Sri Lanka is an island country in South Asia, located about 31 km off the southern coast of India. After over two thousand years of rule by local kingdoms, parts of Sri Lanka were colonized by Portugal and the Netherlands beginning in the 16th ...
Postage stamp demonetization. The demonetization of postage and revenue stamps is the process by which the stamps are rendered no longer valid. In general, stamp demonetization is a rare event, since any unused stamp is effectively equivalent to its face value, and there is no financial disadvantage if postal customers use old stamps on their ...
The usual shape of a postage stamp is a rectangle, this being an efficient way to pack stamps on a sheet. A rectangle wider than tall is called a "horizontal design", while taller than wide is a "vertical design". A number of additional shapes have been used, including triangles, rhombuses, octagons, circles, and various freeform shapes ...
Postage stamp problem. The postage stamp problem is a mathematical riddle that asks what is the smallest postage value which cannot be placed on an envelope, if the latter can hold only a limited number of stamps, and these may only have certain specified face values. [1]
Apollo 15. The Apollo 15 postal covers incident, a 1972 NASA scandal, involved the astronauts of Apollo 15, who carried about 400 unauthorized postal covers into space and to the Moon's surface on the Lunar Module Falcon. Some of the envelopes were sold at high prices by West German stamp dealer Hermann Sieger, and are known as "Sieger covers".
A 1958 stamp of the Soviet Union depicting a 16th-century mail courier for the 100th anniversary of Russian postage stamps. A 2008 stamp of Russia dedicated to the newly elected President Dmitry Medvedev. This is a survey of the postage stamps and postal history of the Russian Empire, the Soviet Union and the modern Russian Federation.