cover 1915 and 1916 (2) unstamped envelopes from Germany to P.O.W.'s in Okahandja via the Red Cross in Geneva, each showing Red Cross or "Bureau International de la Paix" cachets and franked with Transvaal Postage Due 1d. (5) or 5d. (2) cancelled on arrival; the first with some staining, otherwise fine and an unusual group.