Tomoe Soroban Arithmetic Board, Abacus, 23 Digits, A-Type Standard, Birch Ball, with ebony frame. Made in Japan, very well made. Pre-owned in excellent condition. First photo stock. Includes used case to protect it. East Abacus - Soroban. Very popular. Current standard type 1 ball (having a value of five) and 4 balls (having a value of one)