Netherlands West Indies. (Curacao - Hong Kong). 1940. Air Mail envelope addressed to Medan, Netherlands Indies bearing Curacao Yvert 122, 6c violet and Air Mail Yvert 12, 60c violet-brown and Yvert 14, 1g40 brown tied by Willemstad double ring '14th Feb 41', sent by 'China Clipper' with 'Opened by Censor/ Hong Kong' label (red on white) and 'Diboeka Oleh Door Censuur Geopend' label tied by circular 'Ned. Indisch Deviezen Instituut/ Deviezen Censuur/ 1' in carmine on face and reverse with 'Voor Vaderland en Vrijheid/ Nederland Oost Indie Curacao Suriname/ Steunt Het Prins Bernhardfonds' Patriotic label on reverse (For Country & Freedom/ Netherlands West Indies Curacao Suriname/ Supports The Prince Bernhard Fund).
Lovely routing from the West Indies to Hong Kong on China Clipper and from Hong Kong via Saigon and Singapore to Batavia. This air route existed from 1938 to 1941 (until the Japanese Occupation of Indo-China July 1941).