Postal service traffic between Mother country and occupied protectorate over the \"German benevolent society Stockholm\", 1918, with Berlin sender mailed letter via Stockholm 4.2.18, with Swedish 20 Ö stamp to Swakopmund, of the South African foreign censorship in Capetown with violet \"C. 4. \" cancel expertized and withheld with large violet one-line cancel DETAINED, subsequently further with reverse cancellation adjusted railway mail oval cancel SWAKOPMUND 10.2.19, over after a year