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A large mint block of the Penny Black. The idea of an adhesive stamp to indicate pre-payment of postage was part of Sir Rowland Hill's 1837 proposals to reform the British postal system; it was normal then for the recipient to pay postage on delivery. A companion idea, which Hill disclosed on 13 February 1837 at a government enquiry, was that of a separate sheet that folded to form an enclosure or envelope for carrying letters.

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