China. (French Indo-China). 1931. Registered Air Mail envelope addressed to France bearing French Indo-China SG 140, 1c orange, SG 149, 10c pale blue, SG 155, 30c grey and blue and SG 157, 50c slate and green (2) tied by Saigon Messageries/ Maritime date stamp '16th April 31' with matching registration label and Gironde arrival. Scarce maritime postmark.