cover 1879 printed "Legation of United States, Peking" envelope (matching wax seal on reverse) to Shanghai, bearing 1 ca. (faults) and 5 ca. cancelled by Peking seal in blue, showing "I.G. OF CUSTOMS/PEKING" c.d.s. (22.8.79) in blue, "CUSTOMS/TIENTSIN" c.d.s. (23.8.79) and "SHANGHAE/LOCAL POST" c.d.s. (28.8.79) in blue on reverse; small portion of the top left of the envelope has been cut away. Scarce double rate. Photo