Netherlands East Indies. (Penang). 1939. Air Mail envelope addressed to Penang bearing Dutch Indies SG 398, 2 1/2c bistre, SG 403, 10c scarlet and SG 405, 20c purple tied by Soerabaja date stamp '14th Oct 39' with 'Passed By/ 1/ Censor' in black on face.
From the listing of Malaya censor hand-stamps by Konrad Morenweiser in British Empire Civil Censorship, Asia hand-stamp Malaya 2B has censor numbers from 2 - 41. Censor number 1 not recorded.