Have made some checks with multi-meter..Has 4 wire from motor, No continuity from any wire to frame, I think 25 ohm. resistance thru 2 wires and momentary reading between other 2 wires, then open.If you need other check done with meter , or if you can help with other checks or info of value or what it came from,please contact me. No stuck brushes and bearings turns freely.. 1 end cap is missing.. Appears to be in very good condition.Not sure of value so if priced too high ,give me some info and I will reduce price.Can't find any like it on computer. If priced too low BID AND grab it..Will be listing other vintage ham electronics and radio transmitter / receiver parts