Thailand. (Australia). 1941. Air Mail envelope addressed to New Haven, Conn. bearing Thailand SG 242, 25s blue, and SG 296, 50s grey and SG 297, 1b blue and grey tied by Bangkok GPO date stamp '9th May 41' with circular '2' censor cachet in violet on face and hand-stamped 'California Clipper'. routed via Sydney, Australia with 'Opened by Censor / 2' label tied by triangular '2/Passed by Censor / 798' and arrival 'June 13 1941' on reverse. Very fine.
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.
Having recorded over one hundred Thai censor hand-stamps from 1 to 10 we believe 6 or 9 to be the most common and '2 with a serif only two seen by us and this type the only example we have seen. Nils Ramm-Ericson had no examples illustrated in his 'Airmails of Siam' four volumes.