TANGANYIKA 1917-21 20r black and purple/red 'G.E.A.', SG61Tanganyika 1917 21 20r black and purple red, 'G. E. A.' overprint, SG61. A very fine and fresh mint example with original gum. After the Allied invasion of German East Africa in World War I, civilian mail was accepted by the Indian Army postal service using Indian stamps overprinted 'I. E. F.' Some offices, however, reverted to civilian control on 1 June 1917. They used these stamps from East Africa and Uganda, which then included the "G. E. A."