1939年上海寄纽约航空封1件,贴伦敦一版孙像20分,港版孙像1元各一枚,销上海5月26日戳,另盖紫色“By Pan American Ariways Service”邮路指示戳,保存完好ChinaPostal HistoryRepublic of China1939 (26 May) air mail cover to New York, bearing London print Dr, Sun franking $1.20, tied by Shanghai c.d.s., with By Pan American Airways Service handstamp in purple.































