A little more on the USPO in Shanghai

I noted the USPO in Shanghai in 1935 was the only overseas PO the USA had at that time. The USPO maintained a United States Postal Agency at the Shanghai American consulate through which Americans could use the US Post Office to send mail to and from the US mainland and US territories. Starting in 1919 the 16 current regular US stamps were overprinted for use in Shanghai with the city’s name, “China”, and amounts double their printed face values.