The old abacus refers to the Ming and Qing Dynasties to the Republic of China. Abacus beads are oblate, and common abacus beads are oak, pear and jujube. The upper edge of the frame is ordinary hard miscellaneous wood, and the corners are covered with iron sheets. The abacus beads used by the rich are made of sandalwood, Huang Huali and rosewood. The frame is mainly made of high-grade mahogany with white copper edges and corners. Some abacus beads are heavy and difficult to move. Some abacus beads are made of jade, but they are not practical.
The abacus in the picture has only one bead. Beads are flat, and the beads on the frame may be oak. The oak tree is heavy and difficult to move. It is an old object, but it is relatively new than before the Republic of China. Judgement is a product of the 1950s, which is acceptable as a collection, but of little value. Please forgive my mistake, thank you.