Great Britain 1861 1d rose red Plate 51 (Alphabet IV), SG42Great Britain 1861 1d rose red Plate 51 (Alphabet IV), SG42. A very fine and fresh unused, with original gum, block of four lettered 'NG OH'. Lovely colour. Accompanied with a 1984 British Philatelic Association (BPA) Certificate of Authenticity. In 1856, the letters on these stamps were engraved by hand on the plate as an experiment instead of being punched. The experiment was abandoned and punching was again restored from plate 52. Plate 51 was not