India. (Netherlands East Indies - Marine Post). 1941. Air mail envelope addressed to 'Netherlandsche Department of the Marine, Batavia' bearing India SG 251, 2a vermilion, SG 254, 3 1/2a blue and SG 259, 1r brown and black tied by Bombay roller '4th Nov 41' with triangular 'Passed By Censor/ C - 18' with 'Batavia/ 6' censor arrival '15/11' in red with framed 'Niet Door Censuur Geopend/ 11' in carmine on face and hand-stamp 'Marine-Censor/ 1'.
Unique item showing Netherland Indies marine censor as well as Not Opened and Censored cachet.
Ex Paul Bulterman and illustrated in Nico de Weijer's wonderful book on Netherlands East Indies censor mail.