1906-1920 a group of 3 incoing covers to China via USPA Shanghai,
Shanghai French PO and German Sea Post
1906-1920 a group of 3 incoing covers to China via USPA Shanghai,
Shanghai French PO and German Sea Post respectively.
1906至1920年一組三件經客郵局進口封，分別經上海美國郵政代理、上海法局客郵局及德國海郵經手。
