Treasure Hunt 3

INDIA EXPEDITIONARY FORCE, 1914 registered cover to Bombay, franked with strip of four 3p grey, single and pair 1/2a green, and 1a carmine, all with I.E.F. overprints . Stamps tied by FPO No 116 c.d.s.'s of Alexandria-Sidi Bashir (in use only from 11 / 18 / to 3 / 20), and front shows violet PASSED BY CENSOR handstamp. A rare cover from this Field Office. SG No. E1, E2, E3.