GREAT BRITAIN 1964 (MNH) 6D BOTANICAL CONGRESS SIGNED CYLINDER BLOCK
6d Botanical Congress ordinary cylinder 1D–1C–1B–1A block x 4 signed in the lower margin by stamp designers Michael (1921–2009) and Sylvia Goaman (1924–2006). Scarce. Fresh and fine. Mint never hinged. SG656; SC415
