Thank you Skilled, and a very nice set of grip panels also !
The jig marks, although most Roper/Gagne stocks had them so did a few other makers stocks occasionally, and there is nothing uniquely difficult about making that mark. In my opinion it should not be used solely and a means to confirm the maker. A number of years ago the jig mark came up and I voiced the opinion that if that was all it took I'd be right back, went to the garage found appropriate nail and applied file, made "jig" marks in a set underway then took photo and uploaded, about 20 minutes. My point was anyone can make the mark.
And to be clear at this point I'm doubtful that Mathias Gagne made the grips for G&H but certainly willing to be proven wrong or even prove myself wrong. If a documented set of G&H revolver stocks can be found and we can see inside then that just may wrap it up. It's just research, there is no trophy or prize money so I don't see the need to wrap a bow around it ASAP.
Just my thoughts, and thanks to all for the input.