Thailand. (Air Mail). 1940. Air Mail envelope addressed to New Jersey bearing Thailand SG 242, 5s deep blue (5) and SG 243, 50s black and orange tied by Bangkok /GPO date stamp '17th Oct 40,' endorsed 'Via Lagos/Back to Horseshoe route' (erased) with 'By Air Mail via Trans-Pacific Clipper / via Auckland' hand-stamped 'Imperial Airways' and 'California Clipper' routed via Australia with 'Opened by Censor' label tied by 'Passed by Censor / S. 412' hand-stamp in violet. Lovely item.
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.