Here is a very nice Bell Systems Phone booth light thats complete with all screws ,mountings, glass dome and the bakelite key thats stamped Bell Systems . You need this bakelite key to open the light fixture to change bulbs    .It came out of a fully working 1940s wooden phone booth made by Western Electric.

 I tested it and it works perfectly. I have a celing that this was mounted to thats in perfect shape and if you pick up the lihjy in person its yoirs at no extra charge