China. (Indo Chinese Post Office in Yunnan). 1906. Registered envelope addressed to France bearing French China SG 12, 75c brown/orange and SG 37, 25c blue (3) tied by Mong-Tseu-Chine double ring with boxed hand-struck 'R', routed via Laokay and Haiphong/Tonkin with Paris receiver on reverse. Scarce use of the 75c in Yunnan Province.