![Keystone Electric Traffic Tower](http://www.collectingkeystone.com/wp-content/uploads/2023/01/Keystone-Electric-Traffic-Tower.jpg)
This is a very hard to find item with the box. It is 6″ tall. You install a battery which powers a lightbulb. When you turn the knob at the top a barrel with cut outs will lights up the various signal colors. This appears in the 1950 catalog.
From my private collection.