China. (Imperial Airways via Hong Kong). 1939. Registered Air Mail envelope addressed to Amsterdam, Netherlands bearing SG 425, 45c violet, SG 427, 60c blue and SG 429, $1 yellow-green tied by Shanghai date stamp '13th Nov 39' with matching registration label, endorsed 'via Hong Kong and per Imperial Airways' with Registered/ Hong Kong transit '20th Nov', bilingual 'Par Avion' label struck with framed 'cross' and Amsterdam arrival '2nd Dec' on face.
Attractive cover sent Imperial Air via Hong Kong with boxed 'jusqu'a' mark indicating end of Airmail service.