Cambodia. (French Indo-China). 1939. Air Mail envelope addressed to France bearing Indo-China SG 170, 3c brown, SG 177, 6c vermilion and SG 184, 15c deep blue (pair) tied by Stung-Treng/Cambodge date stamp '19/9' routed via Phompenh '21/9' with censor tape tied by oval 'Ouvert/ Par/L'Autorite Militaire' and circular 'D/1' censor cachet with 'Par Avion' label. Very fine.