tied by "U.S. Postal Agency Shanghai Jan. 4 1PM 01" duplex to cover used from Tientsin to San Francisco, Chinese Imperial Post 10c Green tied by "Tientsin 30 Dec. 1901" datestamp, January 2 Shanghai and January 27 San Francisco backstamps, tiny cover tear at top, very fine and scarce combination, the United States Postal Agency forgot to change the year date slug from 1901 to 1902 in the duplex

Provenance: Drucker Family (R.A. Siegel Sale 855, 2003)