בידספיריט | British WWI military mail in

British WWI military mail in Egypt: 6 JU 1917 stampless OHMS stationary cv ex Garrison Officers Mess at FPO F2 (ABBASSIA) to CAIRO tied by Proud-D2 pmk & 2 strikes of FB-unlisted red GOM | ABBASSIA unframed cachet; b/s next day APO SZ10 (CAIRO) transit & same day CAIRO-F arr.; slit open at right.