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POSTAGE STAMP, 1840. The Penny Black of Great Britain #7541019
British Guiana 1c magenta - Wikipedia
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The Wallace Document. The World's First Postage Stamp: The Earliest Known Example of the 1840 Penny Black | Treasures | 2021 | Sotheby's
File:The first postage stamp of Spain.jpg - Wikimedia Commons
The Story of the First Postage Stamp | Arts & Culture| Smithsonian Magazine
TWO PENCE BLUE ISSUED 1840-41 THE WORLD'S SECOND POSTAGE STAMP POSTAL SOCIETY | eBay
