Netherlands Indies. (Japanese Occupation in Java). 1943. Stamp-less Official mail envelope hand-stamped 'Kao-Yoo' (Official Mail) addressed to Soerabaja cancelled by Matlang date stamp '18th Sept 1943', endorsed 'Soeret Edaran' with framed 'B.D.B.' (Bebas Dari Bea) 'Free Post' and framed Japanese Occupation censor.