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Known as the world’s most valuable and rare stamp, this unique piece was produced during a stamp shortage in British Guiana. Only one copy is known to exist, discovered by a 12-year-old Scottish ...

These are the most valuable stamps from around the world ... and another sold for £495,000 in 2016 ($662,265). A rare 1897 10 cents-on-9-Candareen dark green Dragons and Shou stamp was auctioned ...