בידספיריט | British WWI military mail in

British WWI military mail in Egypt: 12 DE 1919 stampless OAS civilian stationary cv ex FPO SZ 15 (ABBASSIA) r/a Citadel Barracks to LONDON, tied by unlisted 2-line skeleton DS with thick lettering on outer ring & inverted ”v” index letter; slit open at top.