Yep, just found out what they are. Google is awesome.
They're British all right. One is a black powder proof mark, one is a "view" proof mark and the other is some parrabellum pistol proof mark. Not sure why thats on it. They were all made at the Birmingham proof house. Someone must have brought it back to Canada after the war or something. Wierd, why would someone take a Stevens 425 with them over there?
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This is acceptable since the gun was proofed in a national proof house after original manufacture and again when the gun was exported to a different country as a military acquisition.
