Please be aware that we will be closed from December 30th to January 4th, and shipping will resume after that period. Made by Koichi - Ebony - 23 digits In the world of abacuses, where birch beads and boxwood beads are now the mainstream, ebony ones are rare. This one also came from my parents' home and was kept in beautiful condition. Why not add it to your collection? Thank you for viewing.