Here is a wonderful Knapp toy bi-polar dynamo electric motor, the Little Hustler. This toy motor in exceptional condition. It has a finished pine base, bi-polar field magnet wound for 2 to 6 volts and a copper strip brush assembly. The wood base is 3.5 inches by 3.0 inches and 0.5 inches thick. The motor and base are 3.5 inches high. The box is original, some of the old box label is still visible.