General Railway Signal Model G Tri-Color.
https://en.wikipedia.org/wiki/North_American_railroad_signals
Scroll down to GRS model G.
Here is a nice booklet showing the history of Alstom and GRS. Go to pg. 17 for some interesting info on the G and early CTC installations around Fostoria!
http://www.alstomsignalingsolutions.com/Data/Documents/History.pdf
I have one in my collection, too. from the former New York Central, Cleveland-Bullalo main.
Nice find!
Regards, Ed
I purchased it at a sale in Fremont Ohio any information is greatly appreciated.
Thank you
Mike