SOUTH AFRICA 1971 (MNH) 6C MAIZE CYLINDER BLOCKS, PHOSPHOR FRAME
6c Maize cylinder 421A–284 and 421B–284 blocks x 4, perf 14 x 14, Harrison paper (fluorescent front and back), 3 mm phosphor frame, RSA tête-bêche watermark. Fresh and fine. Mint never hinged. SG290; SC334; SACC295
