cover 3d. pale blue on blue on "On Her Majesty's Service" XU5 (central vertical and horizontal creases) to "L.V. Gutenberg, C Troop D Squadron, Protectorate Regt., B.S.A. Fort, Mafeking", cancelled by c.d.s. (13.4); the stamp has a diagonal crease at left otherwise fine. Only a few covers have been recorded to this fort. Photo