Burma. 1939. Air Mail envelope addressed to England bearing Burma SG 2, 1/2a green and SG, 3a 1/2p grey-blue (4) tied by Kalewa double ring '24th Oct 39' After the declaration of war in September 1939 the Empire Air Mail scheme was suspended and air mail rates to the UK became 14 annes for 1/2 oz letters. Ex Proud.