Either in Dougan or Livinston's book has mentioned that Saigon has "agency" relationship with Shanghai LPO. So, that might be the reason why no Indochina nor French stamp(s) are applied. I am surprised that no body has raised the information. By the way, Yokohama and San Francisco were also mentioned in the book. I am still waiting to find covers from or to both places with similar usages. (Today, I am too lazy to use Google Translate to chat with you in Chinese).作者: genel 时间: 2013-5-4 00:25
Kenny,
I would say, any Shanghai commercial usage to overseas is rare, I don't remember that I have seen cover to Saigon from Treaty Ports before your #1 cover.
If Dougan mentioned overseas agencies of Saigon, that explain the #1 cover as a fine example. Good hunting, well done!