GREAT BRITAIN 1966 (MNH) 1S6D GREY-BLUE CYLINDER 1 BLOCK, E/I, PHOSPHOR
1s6d Grey-Blue cylinder 1 block x 6 on whiter paper with two 9.5 mm phosphor bands (applied photogravure) reacting violet, perf type E/I. Marginal wrinkles otherwise fine. Mint never hinged. SG618a; SGS154; SC366p