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Inverted Swan » The Inverted Swan, a 4-pence blue postage stamp issued in 1855 by Western Australia, was one of the world's first invert errors. Technically, it is a "frame invert". In 1854, Western Australia issued its first stamps, featuring the colony's symbol, the Black Swan, as did all WA stamps until 1902. While the 1d black was engraved in...

Treskilling Yellow » The "Treskilling" Yellow, or 3 skilling banco error of color (Swedish: Gul treskilling banco) (Gul=yellow), is a postage stamp of Sweden, and the most valuable stamp in the world.

Prince Consort Essay » The Prince Consort Essay was a surface printed postage stamp essay, created in 1850 as an example of the surface printed stamps that Henry Archer proposed to print and perforate under contract with the British government at a lower price than the current printing firm of Perkins Bacon. The Prince Consort stamps were provided by Robert Edward Branston, from an engraving executed by Samuel William Reynolds.


Penny Black » The Penny Black, the world's first adhesive postage stamp of a public postal system, was issued by the United Kingdom of Great Britain and Ireland on 1 May...

Mauritius "Post Office" » The "Post Office" postage stamps of Mauritius are among the rarest stamps in the world, and are of legendary status in the world of philately. Two stamps were issued, an orange-red one penny (1d) and a deep blue two pence (2d).

Penny Blue » The Penny Blue is an unissued type of postage stamp of Britain. It is from a series of proof impressions which were made at the time Rowland Hill was looking at the new colours which were to be used for the stamps which were to replace the Penny Black and the original 1840 issue of the Two Pence Blue.


Inverted Jenny » The Inverted Jenny (or Jenny Invert) is a United States postage stamp first issued on May 10 1918 in which the image of the Curtiss JN-4 airplane in the center of the design was accidentally printed upside-down; it is probably the most famous error in American philately. Only 100 of the inverts were ever found, making this error one of the most prized...

Basel Dove » The Basel Dove (German Basler Taube; Swiss-German Basler Dybli) is a notable stamp issued by the Swiss canton of Basel. It was issued on 1 July 1845 with a value of 2 1/2-rappen...

CIA invert » The CIA invert is a one-dollar value postage stamp error issued by the United States Postal Service. It is one stamp from the Americana series that were produced between 1975 and 1981. The $1 colonial rushlight holder stamp...