1918, 5 C green/black and 15 C blue-green/black, each in blocks of 4, mixed franking used on blackened provisional German East Africa 7 1/2 H postal stationery envelope, sent registered from KIGOMA, 4.JA.18, to Bern in Switzerland. On reverse British Forces transit cds F.P.O.N°320, 9.JA.18, further transit London and arrival mark Bern, 15.III.18. F/VF condition (Image)