South West Africa Officials 1931 Imperf Plate Proof Blocks

OFFICIALS: 1931 ½d, 1d, 2d & 6d (SG O13-O16). Full Set in IMPERFORATE PLATE PROOF BLOCKS OF TWELVE being the matching top left corner blocks of each value. VF/UM, mainly superb UM, couple isolated wrinkles mentioned for accuracy. Showpiece array for connoisseur being the singularly most important material for this issue. Ex SWA Post Office archives. See additional image below.