I now know what this model is, it's called a "sweep" meant to be powered by horse(s) moving about in a continuous circle, generally hooked via a very low-slung drive shaft connected to a tool outside of the horse's path. it is 4 1/2" sq x 3" tall & weighs 1 lb. 10 oz. & has a 14" long swing arm.
video of horse drawn sweep
https://youtu.be/LCTpyNMQzz0?si=gxriKFVP7j7lVpTC
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