Here is an exceptional bi-polar dynamo electric Ajax Porter K&D No. 2 Toy Battery Motor.This is a very nice working toy motor. It has a bi-polar field magnet wound for 2 to 6 volts and the commutator has a spring loaded copper "strip" brush assembly. At the base it measures 3.75 inches by 2.75 inches and is 3.75 inches tall.

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