Bidspirit auction | British Commonwealth - South West

British Commonwealth - South West Africa - AIR POST STAMPS : 1930, inverted overprint (large letters) ''S.W.A.'' on South Africa Biplane 4p green, bottom margin single, full OG, NH, F/VF, S. Sismondo certificate, SG #72b, £200++, Est. $250-$300, Sc. # C3b