Welcome to the forum. That is quite a gun you have there. If you haven't already, I suggest you send for a letter of authenticity and then a query to the Historical Foundation to see if they have any more info on it. A lot of those old RM's have some interesting history that goes with them. By chance, would you care to share the Reg number that is stamped inside the yoke? From that, we may be able to tell you some more of its history.

And......We all love more pictures, especially close-ups.

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John
SWCA #3401 SWHF #737