Dan, I disagree with your premise that ALL these inlays were mass produced. Proof that this is NOT the case is
right here in the library under "tools of a gunsmith". Wm. Shreckengost's vast array of inlay templates are intact to this day
in a local collection and the cardboard they were cut from shows the partial name of a local hardware store here
in western PA. In other words he repurposed the hardware store boxes to make his templates.
I find it hard to grasp how I can spend my time
tracking down things to post on this forum for guys to learn from and
have guys look at them and refuse to acknowledge what they are seeing.
You don't need a template if you are buying them already cut out.
As for already engraved, this is also not the case. I won't bother with the electron microscope to prove that the
gravers and shaders were used on his guns and no others. It's clearly his hand on all his rifles.
Yes, there were mass produced inlays on later rifles, but the examples I provided were not.