China. (French Indo-China ). 1931. Registered Air Mail envelope addressed to Paris bearing Indo-China SG 124, 6c red/black and SG 154, 25c magenta and red-brown (3) tied by Hanoi R.P./Tonkin date stamp with registered label and boxed 'Par Avion/ Saigon-Marseille/Voie Hollandaise (KLM)' in red with Paris arrival.