Burma. 1939. Air Mail envelope addressed to Switzerland bearing Burma SG 27, 3a6p blue and light blue (3) and SG 29, 8a green tied by Rangoon/ G.P.O. double ring with 'Passed Censor/ Rangoon/1' cachet and 'Opened by Censor' label, underpaid with 'T' hand-stamp and bearing Swiss postage due 20c red applied and tied by Glarus/Pakete receiver. Nice combination.