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 ...
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Precious US stamp from 1868 expected to sell for eye-popping sum: 'Rarest of the rare'The Benjamin Franklin Z-grill is one of the rarest and most sought-after stamps in America. Only two Benjamin Franklin Z-grill stamps exist, with one belonging to the New York Public Library.
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