South Africa 1926 1d Imperf Three Sides, Block with Cert, Rare

1926-27 1d black & carmine IMPERF THREE SIDES (SG 31b). VF/M/UM block of four, bottom marginal, the variety affecting both left hand stamps, hinge marks on top pair and margins only, fresh. Spectacular, rare. Photo-cert: Eichele BPB "A fresh and rare block.".