Malaya. (Field Post Offices). 1939. Air Mail envelope addressed to England bearing Straits Settlements SG 279, 2c green, SG 281, 5c brown and SG 285, 12c blue (block of four) tied by Field Post Office/ S.P. 501 double ring with circular 'Passed by R.A.F. Censor' on face and signed by the Commander. Very fine.