בידספיריט | British WWI military mail in

British WWI military mail in Egypt: 4 MR 1920 stampless (OAS) civilian stationary cv ex APO SZ 10 (CAIRO) to DEREHAM, tied by very rare Proud-D2/state2 pmk 2 weeks after Proud's only recorded date of use (21 FE 20) ; opened roughly at top, complete.