South Africa 1931 (19.DEC.) 3rd flight Reg. Keetmanshoop to Grootfontein bearing  4d 'air' adhesive of South Africa overprinted S.W.A. (SG 70) block of 4 with Serif to the ovpt. W and 2d (SG76) pair all tied by black rubber LUGPOS/KEETMANSHOOP/AIR MAIL handstampand ,  and date cds. same day transit and arrival cds on back.