Another point to be made. These guns were not limited to their borders. Tom Ames did an excellent article on "Schimmels" in the KRA journal some years ago. These guns were often picked up by "tinkers" (travelling salesmen) and taken to the frontier for sale with cloth, tools, pots, ect.
There is lots of evidence to suugest that gun production in this area was unique. Most gun makers , then as now, make rifles to order or spec. They did this as well, ( consider a beautifully finished heavy target rifle signed John Derr without B.P. and with a strap T.G.) but also made roughed out guns in the white, just lock, stock and barrel. It kept them busy when there were no specific orders. And gave them quick sales when things got busy.
A customer could come in and pick a gun and have it finished in jig time plain or fancy.
AND a tinker could buy them as they were, finish them quickly and apply a strap guard himself. Ames noted that roghly finished guns of different style often had similar guard straps and guns with identical style had different guards.
Or, the plain guns, still cheap, could be finished and sold that way for sale on the frontier.
THey were a part of history far beyond their little area.
My theory, and it's only that, is that these really rough pieces were the work of tinkers, and the better pieces, though dead plain but with consistent guards, were the ones finished in the shop of the gunsmith.
My