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8 postage stamps that sell for high prices (some are worth millions)

The Inverted Jenny is a famous misprint stamp from 1918 that features the Jenny plane—or the Curtiss JN-4, used to carry mail ...
Artnet

A Rare U.K. Stamp, Legendary for Its Misprinting, Heads to Auction

Between 1841 and 1879, British authorities issued billions of Penny Red stamps, serving a communication revolution driven by rising literacy rates that saw letter-writing boom. Philatelists are ...