DanLH, that's a pretty wide geographic distribution. I've been thinking about this a lot, with no particular conclusions though. The style is certainly distinctive and should be easy to identify in other guns if need be. For a couple of things, the contour transition between the point of the comb and top of the grip is much more gradual in your examples than those from other makers, but seems very consistent here. The contour at the ejection port is likewise more along the lines of an armory stock. And the S shape of the grip bottom is very different from others.. also more "heavy handed" and obvious if you will.
It can be tricky to tell from the photos, but the checkering appears to use a 3 1/2 to 1 proportion diamond, and this appears consistent too. The other example from James - I seems to have a 3:1 proportion. Not the same maker. The checkering is oddly proportioned and located, less delicate and artistic than from other makers, and includes a lot of surface,area. I might tentatively conclude from all this a few things.... I don't think this guy was a "master" although he may have worked around or been influenced by one. From the quality of the checkering and consistency of style, I would conclude that he was a good "mechanic" but somewhat lacked an artistic sense of shaoe, design, and proportion, at least to the extent exhibited by the better known makers of the time.
So he may have been locally or maybe regionally known, but never achieved top status. He might have worked as a carver in the furniture industry for example, copying patterns provided by others. Or maybe in some other aspect of wood working, and did gunstocks as a sideline. It would be hard to identify his styles as "Germanic" for example, although a bit easier to consider it a bit primitive or self taught in the "Grandma Moses" sense. And imho the style is rather unlike anything else from the era.
I'm sure at some point it will be possible to identify a certain area or individual. I hope so anyway. I will assume that these have been disassembled and that there are no helpful stamps or inscriptions inside..