Bruce, one of the challenges in building early rifles when there are very few examples that can be reasonably attributed to a specific place and time, is that there is little reason to be confident that one example is representative of what was going on in an area around that time.
Examples:
Musician’s rifle 1750’s? Nothing like it before or after (I am baiting EK here lol)
Schreit rifle 1761. Berks County, PA, originally with a stepped wrist, quite different from the other Reading rifles
Brass-barreled rifle possibly Virginia,possibly made by a Honaker, 1771. Does not seem representative of a “type”.
This does not at all preclude anyone from being creative. I’d just not call it a Klette or whatever.