Great Britain 1955-58 Queen Elizabeth II 11d. brown purple. Watermark St. Edwards Crown. IMPRIMATUR BLOCK OF FOUR. From the National Postal Museum Archives. ‘Imprimatur’ comes from the Latin word for ‘let it be printed’ and applied philatelically to the first sheet that was printed from an approved Plate. It was custom for the printers to start the printing by producing six initial ‘test’ sheets, one of which was left imperforate and retained as the Imprimatur, while the other five were perforated, gummed and put into circulation. Handstamped ‘NP IMPRIMATUR’ on reverse. FROM THE SINGLE SHEET PRODUCED THIS IS ONE OF TWO BLOCKS OF FOUR IN PRIVATE HANDS. AN EXCEEDINGLY RARE AND IMPORTANT EXHIBITION SHOWPIECE FROM THE REIGN OF QUEEN ELIZABETH II OUTSTANDING.
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