Sumatra. Definitive issue. 10 Colour proofs with hiragana overprint 'mihon' (= specimen) in red or violet nos. 03pdba, 03pdbb, 03pdbc, 04pdbb, 07pdba, 10pdba, 10pdbb, 11pdba and 11pdbb. € 900

Sumatra. Atjeh. Moehammadijah series with red Atjeh star overprint nos. 111r-61/65, unused. Signed Boekema. € 730

Sumatra. Atjeh. 1, 2 and 2½ cent Kreisler with wmk, 3 and 3½ cent without wmk, 5 cent Numeral, 3, 4, 5 and 7½ cent Dancer, all with framed Dai Ni Hon overprint in combination with Atjeh star nos. 821v/111v-15b, 821z/111v-16b, 821z/111v-17b, 821v/111v-18a, 821z/111v-19a, 821v/111v-42, 821r/121v-69, 821z/111r-71, 821v/111v-68 and 821v/111v-70, all cancelled except 7½ cent Dancer. Ca. € 550

Sumatra. East Coast. 25 Gulden Van Konijnenburg (corner perf missing) with black Dai Ni Hon overprint without frame on the country name, similar to type 811, unused. Unlisted, few other examples on other values are known

Sumatra. East Coast. 10 Cent Malaya/Pahang no. 211z-M11b on open large Singer cover sent as a document from Serbalawan 18.7.16 to Medan, backstamped by Singer 19 July. The postal rate for an inland document weighting 0-250 grams is 10 cent

Sumatra. Tapanoeli. Hinomaru overprint in fine type 211 and coarse type 221, in red, orange or purple on a nice selection of 34 mostly used stamps types Kreisler (amongst others no. 221p-22a unused), Van Konijnenburg (such as no. 221o-53k), Numeral and Dancer. Few are signed by Boekema. Ca. € 800

Sumatra. Tapanoeli. 10 Gulden Van Konijnenburg with red coarse Hinomaru overprint no. 221p-57, unused. Signed Boekema. A rare stamp! Cert. Van Dieten (2020). € 900

Sumatra. West Coast. 25 Gulden Van Konijnenburg with black cross overprint no. 332z-58, cancelled Padang. Signed Boekema. Cert. Van Dieten (2019). A wonderful stamp! € 500

Sumatra. West Coast. Violet or black cross overprint for the West Coast and Riouw in combination with violet or black small Dai Ni Hon Yubin overprint on 21 used or unused stamps, amongst others the 5 gulden Van Konijnenburg no. 870v/330z-56. Most signed Boekema

Sumatra. West Coast. 25 Gulden Van Konijnenburg with violet Dai Ni Hon Yubin overprint in combination with black cross overprint no. 870v/330z-58, unused with sheet margin. The black spot on the right is not a perf missing but part of a black cross overprint. A delightful stamp! Cert. Van Dieten (2019). € 900

Sumatra. West Coast. Small or large Dai Ni Hon Yubin overprint in violet or black in combination with black standing ('Greek') cross overprint of Pajakombo, used or unused, on 7 stamps. Signed Boekema

Sumatra. West Coast. Japanese stamp 2+1 sen to commemorate the fall of Singapore no. J56 in block of four, cancelled Padang 15.5.50.-9.

Sumatra. Riouw. 50 Cent Kreisler with black Dai Ni Hon Yubin overprint in combination with black cross overprint of Bengkalis no. 881z/386z-34a, cancelled Bengkalis. Slightly stained, but a rare, unlisted stamp! Opinion SvL: the overprints and postmark are genuine. Ex Jacobs

Sumatra. Benkoelen. 2½ Cent Kreisler with black monogram overprint S of postmaster Soeleiman no. 381z-17b, cancelled Kepahiang 18.7.22.11. The stamp is in very fine condition, only a few copies are recorded. Opinion SvL: the overprint is genuine. € 500. Ex Jacobs

Sumatra. Benkoelen. 30 Cent Van Konijnenburg with black Star of David overprint no. 398z-48, cancelled Benkoelen. Opinion SvL: the overprint is genuine. € 300

Sumatra. Benkoelen. 40 Cent Kreisler with black Star of David overprint in combination with black Benkoelen cross overprint no. 398z/392z-32b, used. A rare stamp! Opinion SvL: the overprints are genuine. € 350