VERY cool.
Scroll down to the bottom of the thread Bob linked and the links are good
https://www.trapshooters.com/threads...6e-sbt.832915/
Here is Boa in the October 7, 1916
Sporting Life
Bob Hamilton will get a kick out of this thread!
Possibly one of our Canadian brethren could explain the proof marks. Was the gun shipped to England first for proof at the Birmingham Proof House, then to Canada for sale?