Thailand. (K.L.M. Air mail). 1938. Registered Air Mail envelope addressed to Springfield, Mass. bearing SG 258, 50s black and orange tied by Bangkok/ 5 date stamp '10th Sept 38' with matching registration label and endorsed 'K.L.M.' with New York and Springfield arrival 'Sept 26' on reverse.
Franked at 35 satang for foreign letter rate and 15 satang registration fee, Carried Don Muang to Amsterdam and then by ship over the Atlantic.