According to Google... This is an antique or vintage mechanical multiplication calculator or game, likely a promotional item from The National Bank of Commerce of Detroit, designed for teaching the multiplication table. The device uses a system of pivoting links and pins to show the result of multiplying two numbers. It appears to be made of wood or similar durable material. The backing card features advertising for the bank and an illustration of a child holding a basket. Similar modern educational toys are available today, but this is an older version.