An auction worker poses with a British Guiana One-Cent Magenta stamp as it is displayed at Sotheby's Auction House in London, Britain, 28 April 2021. The stamp is the only known survivor of its kind and was created as a contingency in 1856 when a shortage of stamps usually imported from England threatened to disrupt the postal service throughout British Guiana. With an estimate of 10 to 15 Million UIS Dollars, it will be auctioned at Sotheby's New York on 08 June 2021. (Photo by Jill Mead/The Guardian)
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