British army postal service in the Rhineland 1918-1926 ZKr ARMY post OFFICE A 21 MR 21 S. 120 on registered letter to London, because the franchise for British military personnel at the 25.8.1920 was canceled, must the picture postcards to the regular postage sets franked become: 1/2 d green horizontal pair, 1 1/2 d red-brown, 2 1/2 d violet ultramarine postage stamps issue King George V. 1912, various transit and arrival postmark at back, you would note also the special registered label for field post shipments