Thailand. (Australia). 1941. Air Mail envelope addressed to New York bearing Thailand SG 295, 25s orange and blue, SG 296, 50s grey and orange and SG 297, 1b blue and grey tied by Bangkok GPO date stamp '8th Oct 41', with circular '1' censor cachet in violet on face, endorsed 'via Auckland' and hand-stamped 'California Clipper', routed via Sydney, Australia with 'Opened by Censor/ 2' label tied by 'Passed by Censor' hand-stamp in violet.
Letter from Bangkok carried by BOAC or KLM to Sydney, censorship applied and the hand-stamp 'California Clipper' (to indicate Transpacific mail to be redirected at Auckland into the PAA service), from Sydney flown Tasman Empire Airways to Auckland.