Seen no evidence that WAS was working at GRRW but that is based on no real research on my part.Here’s my WAG:
Could it be a Green River Rifle Works?
I heard the employees were allowed to build rifles in their spare time- maybe WAS worked there and built it for Big Joe Lynn?
My assessment lacking actual information, WAS was a professional level gun stocker. He had much more experience stocking that the 6 guns inferred by my No. 6. Inletting is near perfect for the most part. The finish is immaculate....not a goober to be seen. Plus finish is a "poly something" than suggests the vaunted 'eggshell' beloved by John Bivens. Something I have found impossible to do with poly anything. Guessing he mainly stocked/built modern rifles and perhaps dabbled in muzzleloaders. This may account for old timer blackpowder shooters never having heard of him.