This abacus comes from a former school and has been in use there since the 1940s. It was designed to a high standard – with mortised corners – for rugged school use! with eleven rows of beads, this vintage abacus is a unique blend of practical design and nostalgic charm. The upwardly curved wires were designed for simple calculations with ten beads per row and an additional wire with four beads for fractions. It makes a great decorative piece for your home, study, office, or business and can, of course, still be used as an educational toy. Perfect for math enthusiasts, history buffs, or those looking for a unique gift, this abacus adds educational charm to any room. The abacus is in very good vintage condition.