Japanese Wooden Abacus Soroban Math Calculating Tool Vtg 1/5 Beads 15 Rows ST69 Ceramic 6 cm long x 11

6 cm long x 11

This item features dark gray and white marble stone oval spheres

5 cm wide  x 2

Item weight: 60 grams (with box 120 grams)

Kanji on the box lid: Mino kiln

Japanese Wooden Abacus Soroban Math Calculating Tool Vtg 1/5 Beads 15 Rows ST69 Ceramic 6 cm long x 11Japanese Soroban Abacus Calculator Tool This is a vintage Japanese abacus or soroban. It is a mathematical calculating tool and is considered the first calculator in Japan. The Japanese abacus is different from the original Chinese version. It has a top section of single beads and a bottom of stacked beads, usually five. At the center is one unmarked stack used for decimal places for more complicated calculations. Many primary schools all over Japan