Great Britain 1840 1d black, plate 3, SG2 mint block of 12. This mint block of 12 Penny Black stamps is the largest known multiple from Plate 3 in private hands. Provenance from the esteemed Chartwell Collection. Accompanied by a 2012 British Philatelic Association (BPA) certificate. One of the crown jewels of Great Britain philately. The magnificent unused original gum, bottom marginal block of 12 is lettered SD-TI, with rare full deckle edge selvedge, four good margins and sheet…
