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2/1917 WWI Egypt British military mail with unrecorded APO SZ4 ISMAILIA postmark
British WWI-era military mail in Egypt: 10 FEB 1919 stampless OAS honor envelope (type W 10814/PP 341 Nov/17) from APO SZ 4 (ISMAILIA) to BIRMINGHAM, tied by strike of 2-line skeleton DS unlisted in Proud, with space between SZ and 4; slit open at top.
