World Post Day: Rare postage stamps around the world
These stamps are among the most collectible anywhere
© Public Domain
The face value of a postage stamp is very little. But those issued in error, or produced as a limited edition, can command millions. And when you factor in age and provenance, it's no wonder some stamps out there are so rare and valuable that collectors are willing to pay a premium to own a piece of postal history.
Browse this gallery and find out which stamps deliver the greatest admiration among philatelists.
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