Great Britain 1840 1d Black Plate 5 cover, SG2Great Britain 1840 1d Black Plate 5 cover, SG2. A huge four margin example lettered 'SL', neatly tied to a clean, fresh wrapper by a red Maltese Cross. Addressed to Carlisle with a London dispatch circular date stamp on reverse for 'OC. 1840.' An exceptional quality penny black cover. Pristine condition penny black covers with four large margins are scarce. A lovely example of the postal use of the worlds first postage stamp and the most important