Netherlands East Indies. (Singapore). 1940. Air Mail envelope addressed to 's'Gravenhague bearing Netherlands Indies SG 402, 10c scarlet (2) tied by Batavia date stamp '16th March 40', routed via Singapore with 'Passed by Censor' label tied by framed 'Passed By/ 58/ Censor' cachet and circular '16' censor cachet in violet on face. Scarce single censor from Singapore.
The single ring numeral censor appears to have been applied to mail in transit from Singapore in early 1940.