Chungking Central Trust - 628 in a block of four with double vertical perforations, 630 block of four with double perforations at the top, three examples with YTT Perfins, and an interesting cover form Siking to Shanghai

Chungking Central Trust - 628 in a block of four with double vertical perforations, 630 block of four with double perforations at the top, three examples with YTT Perfins, and an interesting cover form Siking to Shanghai