SOUTH AFRICA 1971 (MNH) 4C GROOT CONSTANTIA CYL BLOCKS, PHOS FRAME
4c Groot Constantia cylinder 420–418A and 420–418B 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. SG288; SC332; SACC293
