Printed in 1856 as an emergency stopgap when a British Guiana post office ran short on official stamps, exactly one confirmed example has ever surfaced — making it, quite literally, one-of-a-kind in a way almost nothing else in collecting can claim.
Stuart Weitzman — the shoe designer who also bought the 1933 Double Eagle above — purchased it at Sotheby's in 2014, making him the owner of two of the rarest single objects in the entire collecting world.
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