I acquired this in an estate sale. I was told the gentleman worked for Canadian National Railway (CN) in Toronto, Ontario.
It’s in great condition and doesn’t appear to be weathered at all. However - there are markings on the base that indicates it was bolted to something at some point. Could be NOS (New, Old Stock) but I have no way of knowing for sure.
The base casting has “Model P” and “21061” on it. Horn castings are as follows:
According to this page, it is a model P135R24 as horns 2 and 4 are reveresed.
Looking to sell for $1500, open to offers.
I am located in Oshawa, Ontario. I can ship if needed.