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1/1919 WWI Egypt British military unfranked mail from SZ 10 with scarce postmark

British WWI military mail in Egypt: 23 JA 1919 stampless registered OHMS "Post Office" stationary cover from S.Z. 10 (CAIRO) to Nasrieh Hospital (CAIRO), tied by full strike of scarce date-bridge postmark Proud-D6; slit open at top, left & right flap tips missing.