Thailand. (Netherlands Post Office in Bangkok). Circa 1945. Stamp-less Air Mail envelope headed 'On Active Service' written by' Kapt. Theelen, ex P.O.W. of the Netherlands Postkantoor, Bangkok' addressed to his wife (returning civilian refugee) on the "S.S. Indiapoera", Netherlands Lloyd, Rotterdam', endorsed 'Per K.L.M.' with m/s 'D/1' in red crayon.
Capt. Theelen had been a Dutch P.O.W. in the Netherlands Indies, while awaiting repatriation he organized the Netherlands Post Office in Bangkok requesting a Swiss style date stamp for use by the Netherlands Mission. The cancel was received by Theelen on the '26th March 1946' and the office closed on the 26th November 1946.