Just an off-chance, but you MAY find one with a Canadian formation number or designation on the butt marking disc. Likely, this would be a rifle that was "liberated" by a returning veteran, as, generally, they had blank butt marking discs installed while undergoing rebuild.
Personally, I have only ever seen 2 rifles marked like this, both Newfoundland Regiment, and one is in a museum in St. John's. The other was owned by my old shooting partner, who liberated it in 1919....... bottle of whisky to the armourer helped a great deal. This was after the march into Cologne.