Hong Kong. (French Indo-China). 1941. Registered Air Mail envelope addressed to India bearing French Indo-China SG 184, 15c blue and SG 213, $1 black (pair) tied by Saigon/Central date stamp with matching registration label and hand-struck 'Vu par la Douane' signed and dated '27/5' , routed via Hanoi, Bangkok and Calcutta with 'Opened But Uncensored/ Passed to Hong Kong for Censorship' censor tape in pink and 'Opened by Censor' label tied by 'Passed by Censor/23' hand-stamp in violet applied in Bombay. Rare item of censorship with rare Indo-china hand-stamp. See Desrousseux.