"Lt. Col. D.N. Martin, In Medical charge of 5th. Ghoorkhas, Parachinor", bearing G.B. 5d. and showing, on reverse, a fine strike of the unrecorded "KHUSHALGARH/BASE OFFICE" (29/12) single-ring d.s. Accompanied by a long letter from the addressee's wife. A rare Tochi Valley Field Force cover