French Indo-China. (Hong Kong). 1940. Registered Air Mail envelope addressed to France bearing Indo-China SG 175, 5c violet, SG 205, 30c red-brown and SG 213, $1 black tied by Hanoi/Tonkin date stamp '18/12/40' with 'Control Postal/ Militaire/A' label tied by oval 'Ouvert/Par/L' Autorite Militaire', endorsed 'Per Pan-American Airways/and Transatlantic' , routed via Hong Kong with 'Opened by Censor/Hong Kong' label and Viney arrival '16 Feb 41' on reverse. Lovely item.