Rare ✨ Unshu Kamesho Soroban [Creator's Mark Included] Kamedake Ideal Type No. 1425, 27 Digits, 4 Beads This is an abacus from Kamesho, a long-established abacus manufacturer founded in 1922. Creator's Mark: Made by Nishimine of Unshu Kamesho ＜Abacus Details＞ ・ 27 digits, 4 beads ・ Kamedake Ideal Type No. 1425 ・ Patent No. 886869 ・ Size: Width 38.7cm Height 6.2cm Depth 1.4cm