Thailand. (Advertising Envelope). 1938. Registered Air Mail envelope headed 'Yodfa Clinic, Memorial Bridge, Bangkok' addressed to Springfield bearing SG 257, 25s black and orange (strip of three) tied by Bangkok/ 1 date stamp '7th July 38' with matching registration label, endorsed 'K.L.M.' with 'Par Avion' label, New York transit and Springfield arrival 'Jul 19'.
Carried by 'K.L.M.' to Amsterdam and onward by ship.