Malaya. (Straits Settlements). 1931. Air Mail envelope addressed to Lon don bearing Straits Settlements SG 221, 3c green, SG 225, 5c orange (pair) and SG 236, 35c purple and orange tied by Katong/ Singapore double ring, '27th April 1931', endorsed 'By Air Mail Singapore - London' and hand-stamped 'First Flight.'