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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.

Great Britain, 1840 Mi.1b, SG.2, Black Penny, black, plate 5, blk-of-6 characters P-I/Q-K, light vert. fold, from the front small, full to wide margins, R very wide margins with part of side stmp, red postmark Maltese cross, exp. Diena and G. Buhler - marks umisteny quite lower (it means. perfect condition), rarity classic philately, according to dostupnych information in the Czech market block this size still never nenabizen, evidently unrepeatable chance, cat. Gibbons minimal. £22500

from Smithsonian

The Story of the First Postage Stamp

The Penny Black and the Penny Red. Englands first stamps. The Penny Black. The World’s first postage stamp went on sale May 1, 1840

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Much More Than Stamp Values Presented in Gibbons Books