China. (Indo-Chinese Post Office in Tchong-King). 1912. Envelope addressed to Paris bearing Chungking SG 24, 25c blue tied by Tch'ong K'ing-Chine double ring '12th Dec 12', endorsed 'via Siberia' and routed via the French Post Office Hankow with Han-Keou-Chine/ Post Francaise transit '23/12' on face.