Thailand. (United States). 1939. Air Mail envelope addressed to Springfield, Mass. bearing SG 254, 5s violet, SG 255, 10s carmine (pair) and SG 283, 10s carmine tied by Bangkok/ 6 date stamp with 'Par Avion' crossed out in red crayon and hand-stamp arrival.
Nice item of 'Jusqu'a mail with Air Mail erased at Office of Exchange.