Thailand. (Goodwill Mission Flight Stage 4). 1939. Air Mail envelope endorsed 'Japan Aviation Company/ First Fight Bangkok' addressed to Tokyo, Japan bearing SG 242, 25s blue tied by Bangkok GPO date stamp '4th Feb 1939' with notation 'By "General Nogi" machine' with Japanese Post Office slip attached indicating Express service and instructions for re-delivery.
Only thirty covers carried on this stage and only a few with P.O. label (slip) attached.