BEF British WWI military mail: cutout of 22 MR 1918 strike of Proud/FB undocumented FPO 1Y (used by FPO 97 on Western Front) pmk, with thick "I.Y" letters; also with date before month - this too unlisted (ref. Proud-D2 & later dated D3), tied next to strike of KC-CM6 type censor used only by BEF on continental Europe.
British WWI military mail in Egypt: 27 JU 1916 stampless OAS civilian stationary cv. (marked "stamp unavailable" - this unnecessary) ex APO SZ 26 (CANAL ZONE) to HAVERFORDWEST, tied by full strike of Proud-D1 on 1st day of use per Proud; front officer-endorsed & passed censor; b/s BAPO-T (PORT SAID) using Proud-D2 w/inverted "A" index; slit open at top, right flap tip missing, vert. fold.