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South Africa 1931 (19.DEC.) 3rd flight Reg. cover addressed to Cape Town  bearing 4d 'air' adhesive of South Africa overprinted S.W.A. (SG 70) block of 4 and 2d (SG76) pair all tied by black rubber LUGPOS/WINDHOEK/AIR MAIL handstampand , transit and arrival cds on back.