South and East Borneo. 10 Cent on 12½ cent stationery envelopetype Kreisler with lilac Bandjermasin anchor overprint Bu.207 (few minor faults) from Balikpapan 28.8.03 to Soerabaja, showing violet censor mark from Balikpapan Bu.JC3a. An extremely rare envelope of which only a few are known. Opinion SvL: the envelope with overprint is genuine in all aspects

West Borneo. 80 Cent Kreisler unwatermarked with violet large Pontianak anchor overprint no. 413v-36a, cancelled Pontianak 7.12.4.5. thus after the Japanese occupation. This stamp is not listed and probably unique. Cert. Van Dieten (2019). Ex Jacobs

Lesser Soenda Islands. Lombok. 2½ Cent Kreisler with red-lilac Lombok Sun overprint no. 511r-17b in pair, cancelled Ampenan 23.4.43.-9. One of the rarest stamps of the Japanese Occupation. Illustrated on the cover of the Van Dieten sale 565 (May, 1997). Desirable exhibition item of the highest calibre! See: J.R. van Nieuwkerk, p.108-110. Cert. Van Dieten (2019). € 6,500+. Ex Mattern, Jacobs

Lesser Soenda Islands. Lombok. 5 Cent Numeral with violet radiating sun overprint no. 511v-42, cancelled Ampenan. Signed Boekema. € 1150

Lesser Soenda Islands. Flores. 5 Sen Gun-Sei Kitte (= Military stamp) postcard on thick light green paper with oval red personal seal from captain Sawa, Bu.282a, unused. Extremely rare, only a few unused copies are recorded (even rarer than the few used cards). See: J.R. van Nieuwkerk, p.202-203. Exhibition item! Cert. Van Dieten (2019). Ex Jacobs

Lesser Soenda Islands. Bali. SERIRIT with written date 20.18.3 and without date (only the fixed dots), both vNV.034, RR. Two wonderful strikes of this very rare postmark on 2 single stamps of 20 cent definitive issue

Lesser Soenda Islands. Bali. SERIRIT without date (only the fixed dots), vNV.034, RR, Negara 9.4.46 (after Japanese occ.) and Singaradja 23.11.45 (after Japanese occ.). Nice strikes of these postmark on 3 single stamps of 20 cent definitive issue

Java. Imperforated ungummed proofs of 150 sen, 300 sen and 2000 sen in blue, KPI.JC5E, 6C and 7C

Java. 5 Sen Savings Bank stamp (printed by G. Kolff & Co., issued in 1944) in block of four on a piece of an envelope, with a red handstamped two-line overprint REPOEBLIK/INDONESIA in frame, used as a postage stamp and cancelled Djakarta-/Yamatobasi 4.6.46. Included also three proofs in different designs, different shades of blue, ungummed (see: Handbook of Revenues, Dai Nippon, p.407, JJD-19). Very rare! Ex Jacobs

Sumatra. Djambi. 5 Cent Numeral with black overprint NIPPON/MA no. 432z-42, cancelled Moeara-/Tambesi. Signed Boekema. Rare stamp and seldom offered! € 400

Java. Postal Savings Bank booklet no. JJD-20 with text 'Tyokin Kyoku' from the Japanese occupation period, saved on 1 June 1946 at the Bondowoso post office, with on the inside 20 savings Bank stamps of 5 sen, all cancelled Bondowoso 1.6.6. Scarce document! Ex Jacobs

Java. Wrongly cut proof of 121.5 x 81 mm for a 3½ sen postcard in red-brown, Japanese type of a ploughing buffalo, Bu.6A

Java. Unused postcards KPI. JK-13, JK-23C and JK-25. On the back in the corners some black paper remains, otherwise fine

Java. Special 10 sen postcard with additional surcharge of 100 sen KPI.JK-25, Bu.RJ26, (not disturbing crease) from Poerwokerto 19.9.46.13. to Tegal

Java. Postcard of 10 + 100 sen for the Liberation Fund in black on grey fibrous paper Bu.RJ20j, from Magetan 6.8.4.7. to Solo -7.8.47. Scarce card!

Sumatra. North Sumatra. Manuscript T-bar overprint in red on Japanese occupation definitive issue for Sumatra of 1 cent, cancelled Baroes ?.?.49 and 2 cent in pair (fine) on money order fragment with not readable office name dated 21.7.30. Scarce! Ex Vrijdag, Jacobs