India. (Netherlands East Indies). 1940. Air Mail stamp-less envelope addressed to the Netherlands cancelled by ''Batavia/ DM/ Ned Indie/ Ct 20 Ct' meter cancel in red dated 4th Jan 40' with 'Per Luchtpost/ Par Avion' label, routed via India with bold triangular 'Passed By Censor/ Calcutta/ C - 100' censor cachet in violet on face.
A rare item of meter mail paying the unopened printed mater rate.
Scarce Indian Calcutta censor only used between December 1939 and January 1940.