Originally Posted by Keith Brown

The key person is Albert, he was taught by his father Mathias, worked for Smith & Wesson and I believe at the right time to be in on the “new “ special stocks. The set in post 108 have a hand chiseled border, a similar to later factory but not fully developed checkering field and enough internal features that Roper/ Gagne come to mind pretty easy.
Don't think it’s a stretch to say Albert had his hands on those.

The earliest Gagne made Roper grips had checkering cut with a chisel, not checkering tools. Not sure when that stopped, guess we’re gonna need the ship date of all these grips to pin it down !