Thailand. (Netherlands Indies - Prisoner of War Mail). 1943. Netherlands East Indies Japanese Occupation 3 1/2 sen grey 'DAI NIPPON' postal stationery card cancelled by Soerabaja date stamp (with two stamps removed by censor), addressed to 'Prisoner of War Camp 6, Thailand' , endorsed 'Tawanan Militer' (Military Prisoner) with framed 'Ken'etsuzumi' (censored) in violet with circular seal of "Takasaki" in carmine.
Two Netherland East Indies stamps have bee removed by censorship checking for a hidden message written under the stamps.