The following are just my thoughts and opinions. I've read through the "1905 with Ropers" thread several times and looked at the photos a number of times and have come to the conclusion that I just don't know if the stocks are Gagne's work. I would lean towards them not being Ropers but the inside surface and the in-letting of the stock circle have a Roper look to them, the shape and profile of the horn and the uncheckered area at the top of the grip have a Roper look also. The checkering looks wrong to my eye but again, hard to say. The lack of the jig marks is the usual conformation that most everyone looks for and these do not have them, knowing how many times I've made a new jig and experimented with different methods of holding the panel for checkering in the few years I've been doing it leads me to believe the Gagne somewhere along the line also did it another way. Because of this thought I think the jig marks alone prove nothing, other features need to also be present some of which I mentioned above. The single most important feature just might be the area behind the trigger guard. On Gagne's Ropers this area actually wraps around the trigger guard bow slightly, a fine bit of work that I do not think any other grip maker did. This feature would be impossible to add to an existing set of grips once they were finished, the jig marks however can be added to any finished grips in an effort to deceive those who might use that feature alone to make up their mind. The first photo show here is an original Roper panel on top of a panel I have underway, along with a tool I made in about five minutes with a nail and a bench grinder, another minutes work and there you have it.
The second photo shows the trigger guard area I mentioned and I tried to draw a line where the edge of the trigger guard bow would be.
This area is quite often broken away but enough is usually left that it's easy to see. I think this feature may be one of the better ones to use when trying to determine if a set of grips are "real Ropers" The set pictured in the 1905 thread do not appear to have this feature.
Hopefully some of the members that have a number of original Ropers or have at least examined them will chime in.
Again, just my thoughts in my usual ramble, not intending to step on any toes.
Keith