Great Britain 1936 ½-2½d Definitives (watermark upright) imprimaturs, SG457/60varGreat Britain 1936 2d Definitives (watermark upright) imprimaturs, SG457 60var. A superb unmounted mint, with full original gum, set of four imperforate imprimaturs with 'NPM IMPRIMATUR" handstamps on reverse. A very rare set of the only stamps issued during the short reign of King Edward VIII from the first approved printing sheet, released by the National Postal Museum . When Edward became king of the United Kingdom in January 1936, he made it clear