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Penny Blacks are the world's first adhesive postage stamps, issued in the United Kingdom on May 1, 1840. They feature a profile of Queen Victoria and were used to prepay the postage of letters. The stamp is notable for its black color and the value of one penny, which allowed for easier mail delivery and contributed to the standardization of postal services. Penny Blacks are highly collectible and hold historical significance in philately.

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5h ago

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