This is an abacus that my parents used when they ran a general store. It seems to have been given to them by "Kosan Sogo Bank." I cleaned it as much as possible, but it's from the Showa era, so there are stains in various places. Some of the beads have blue magic marker on them. There is also rust on the frame. The top bead on the far left side is sluggish. Please understand the above before purchasing.