While I can find many examples of Mutual Sunset Lighting Corporation bridge lamps, I've been unable to find this specific lamp. Any information you might have on this would be very welcomed. It would be interesting to know what the original shade might have been. When it was made and what the possible value might be. What might the finish be? It looks to be brass but I cannot confirm what the painted part is. Would it be a bad idea to restore it?
Hopefully you can view the photos:
https://plus.google.com/u/1/photos/108839706955909407382/albums/6025971104477980097?authkey=CPuk1aj0sOjb3wEThanks!