בידספיריט | British WWI military mail in

British WWI military mail in Egypt: 11 MR 1918 stampless OHMS stationary cv ex Machine Gun Corps Base Depot FPO F2 (ABBASSIA) to 3rd Bn at CLIPSTONE [training] CAMP (Mansfield) tied by Proud-D2 pmk & FB-unlisted dated ”MGCBD | EGYPT” violet oval cachet; sealed at back w/economy re-use label.