1939年广东获海寄美国航空封1件，信封正面印“BY P.A.A， BY AIR FROM HONGKONG”字样，贴伦敦二版孙像20分2枚，伦敦一版孙像1元2枚，销广东获海11月15日戳，邮件经沙渔涌中转，有沙渔涌11月22日汉英三格点线戳，保存完还，沙渔涌为抗战时期秘密国际邮件中转站，其在邮史之地位一直受到集邮界所重视，销有沙渔涌邮戳之邮件至今发现不足50件，少见ChinaPostal HistoryRepublic of China1939 (15 Nov.) By P.A.A./ By Air Mail From Hong Kong air mail cover from Tikhoi to USA , bearing Dr.Sun $1 (2) and 20c. (2) tied by Tikhoi c.d.s., on the reverse with Shayuchun transit c.d.s. (22.11). Shayuchun was a secret international mail transfer station during the Anti-Japanese War. The Shayuchun Postmark have been found to be less than 50, very rare.
