Crouse-Hinds FCB-12 300mm Green Beacon

Overview video of my Crouse-Hinds FCB-12. I believe this unit came from as surplus from the Montana Dept. of Aeronautics. I am unsure of its actual use, be it an airport code beacon or part of their former lighted airway system. I don't think this unit was ever put into service, but it appears to have sat outside at least partially exposed to the elements for some time.