We have been clearing out our parents boat shed and found this searchlight. It's about 20 inches in diameter and is fully working. I can't see any markings on it and searching online see no images that look like it. Can anyone shed light on it? (no pun intended!) Approx age, value? etc I realize it's worth what ever anyone is willing to pay but don't want to get ripped off so any rough ball-park is helpful. Many Thanks
