SOUTH WEST AFRICA REVENUES 1933 PENALTY STAMPS, 20/- DOUBLE

1933 "PENALTY" STAMPS: Interpanneau horizontal blocks of eight of 3d, 6d, 1/-, 2/6, 5/-, 10/- & 20/- (3d & 10/- blocks severed and rejoined). Ungummed, ex the single Bradbury Wilkinson archival sheet, each block has order number and printing date pencilled on reverse. 20/- with variety OVERPRINT DOUBLE. VF, rare & attractive group.