China. (French Indo-China - Singapore). 1940. Air Mail envelope addressed to England bearing SG 426, 30c chocolate and SG 429, $1 yellow-green (2) tied by vernacular Siking (Changan) date stamp, violet 'via Air Mail', routed via Chungking '29 June 40' and carried Air France via Hanoi and Saigon with Hanoi transit '3/7' and 'Controle Postal Militaire' label tied by oval 'Ouvert/ Par L' Autorite Militaire' on face and reverse with Saigon Central/ Cochinchine transit '19 Aout 40', routed via Singapore with brown censor tape and 'Passed By/ Censor 24/ Singapore' cachet in violet on face and reverse.
Much scarcer routing via French Indo-China and Singapore than Hong Kong.