If the piece realizes its estimate, Sotheby’s said it would become one of the most valuable pieces of postal history to have ever been auctioned.
I just found a bunch of 2 cents Washington stamps. How do I know what ones are valuable? - Quora
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I have a bunch of like old stamps. I don't know if they are worth anything, but I got one cent stamps, 5.9 cent stamps 7.1stamp, and a few others. Are they
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First ever piece of mail sent using a stamp could fetch £2m as 184-year-old envelope with Penny Black goes up for auction
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PEACE ARCH STAMP CLUB- PHILATELY - COLLECTING