China. (French Indo-China - Sudan). 1940. Air Mail envelope addressed to Katibogou, French Sudan bearing French Indo-China SG 181, 10c blue and SG 191, 30c chestnut (2) tied by Dap-Cau/ Tonkin date stamp '16th Mai 40' with instructional 'Par Avion jusqu'a/ destination' on face, routed via Hanoi with Bamako/ Sudan Francaise '28/5' and Koulikoro '30 Mai' on reverse with circular 'F/2' censor cachet applied in Bamako. Very fine item of destination mail from China to French Sudan with early censer.