China. (Indo-China). 1940. Air Mail envelope addressed to France endorsed 'Ngo-Khe par Tuyen-Quang, Tonkin' bearing Indo-China SG 191, 30c chestnut tied by 'Poste Rurale/ 3e T.M, H- Giang / Ngo-Khe' double ring with military cachet 'Compagnie du Genie/ Hanoi/ Le Vaguemestre' routed via Hanoi with Uzes arrival on reverse. Very rare item of Rural Post Military mail not recorded by Desrousseaux.