China. (Indo Chinese Post Office in Tchongking). 1916. Envelope addressed to Switzerland bearing Chungking SG 38, 14c rose and SG 39, 15c violet tied by Tchong-K'ing-Chine double ring sent on the steamer 'S.S. Shu Huu' with 'Controle Postal Militaire' label tied by oval 'Ouvert Par L'Autorite Militaire/ 417'. Very fine.