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Gustamps found out that the rarest stamp in the world, which according to Gustamps is also likely to be the most valuable single object in the World Stamp Show in New York U.S.A. next year. Gustamps explain the stamp issued by British Guiana during the reign of Queen Victoria is known as the 1 cent black on Magenta. Gustamps add that although it is the rarest stamp in the world it is far from perfect as all four corners of the stamp have been cut off.