Netherlands Indies. (Japanese Occupation in Java). 1943. Official Mail envelope addressed to Soerabaja bearing Japanese Occupation of Java SG 3, 5s green tied by Soerabaja date stamp '17th Oct 43' with boxed hand-stamp 'Kao Yoo' (Official Mail) and framed 'Ken'etsuzumi' boxed censor with oval censor cachet on face and instructional 'Pindah Tida Memberi Alamat Kembali Sipengiren' on face (Return to sender). Very attractive item from the Japanese Occupation.