GREAT BRITAIN 1962 (MNH) 10D PRUSSIAN BLUE CYLINDER 1. BLOCK, E/I, PHOSPHOR
10d Prussian Blue cylinder 1. block x 6 on whiter paper with two 9.5 mm phosphor bands (applied photogravure) reacting violet, perf type E/I. Fresh and fine. Mint never hinged. SG617d; SGS133; SC366p