China. (Indo-Chinese Post Office in Yunnan). 1904. Envelope addressed to Hue, Annam bearing Indo-Chinese Post Office in Yunnan SG 9, 30c cinnamon tied by Mongtze/ Chine double ring '19th Mai', routed via Lao-Kay '27th Mai' and Hanoi '31st Mai' with Hue/ Annam arrival '6th Juin' on reverse. Scarce item paying the double letter rate to Annam.