Japanese Wooden Abacus Soroban Math Calculating Tool Vtg 1/5 Beads 15 Rows ST69 beige The mouth opening of this

The mouth opening of this kanna is not straight but in diagonal

This medium-sized bottle is kutani ware porcelain and was designed by the famous artist Jun Takekoshi

opening size:3 cm

2658 and 718

Japanese Wooden Abacus Soroban Math Calculating Tool Vtg 1/5 Beads 15 Rows ST69 beige The mouth opening of thisJapanese 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