Rare postage 'gem' featuring the world's first adhesive stamp to be auctioned for up to $2.5 million in New York

Rare postage 'gem' featuring the world's first adhesive stamp to be auctioned for up to $2.5 million in New York

Sotheby's <ul><li>The oldest piece of mail to use a pre-paid Penny Black stamp is set to be auctioned in New York.</li><li>The British Penny Black was the first-ever adhesive postage stamp. </li><li… [+2277 chars]

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