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I have a set of pics from my great, great granfather who was a guide in the revelstoke area. They are very similar to yours. Truly a priceless family heirloom from days gone by. Awesome picture.
I wonder if maybe that double isn't the one that Blob has that Grampa said would go off if loaded and the action closed. I've seen some of those pictures but not all of them . Its very cool to see that the family has been out hunting and fishing for well over 100 years in Canada.