Antique Vintage Auto Motor Engine Block Heater. The outside has a great antique patina like it has been bouncing around in a trunk for a long time, but the inside and the wick looks like it has never been used. It would make a great display item for vintage auto accessory's, or to add to a show car display for a vintage car. Dad told me it was set on the ground under the oil pan to keep engine warm on cold nights so the car would start in the morning. I'm thinking its from the 30's or 40's.