What I got out of a coal mine shaft cap hard hat protection light.

I got the porcelain socket holder out of it luckily and I have 3 small brass screws from it and I believe that it may be worth some money, it is in good shape. The coal mine shaft cap was dangerous that I got it from and the reason I say it is a coal mine is that I found coal in the area, either way it looks really old, it was made from appleton.