Thailand. (United States - Australia). 1941. Air Mail envelope addressed to Sydney, Australia bearing SG 292, 5s violet and SG 296, 50s grey and orange tied by Bangkok GPO date stamp '30th June 41' with bold Thai censor circular '6' or '9' in violet on face, endorsed 'By Airmail/ Per K.L.M. Plane', with bilingual 'Par Avion' label, routed over the Pacific with 'Examined By/ 6868' label anointed '10506' and '281' m/s on label with boxed receiver '4th Sept 1941' on reverse.
Very interesting item from Siam routed via the United States with censor label applied in transit.