A lot of folks think that anything European has to be full blown decorative and excessive, but this is not the case. I remember scouring Hermann Historica auctions through the 90s and they VERY often had 'bundles' i.e. 2 or 3 very plain or crude rifles/smoothbores in a single bidding, and usually those things would go for under $1K for the lot. Many of the pieces might have easily passed for remnants of early American pieces had they not been auctioned through a German auction house. I definitely remember Chris Immel making comments to this effect as well although he seems to have dropped off the planet at this point.
This piece here is neat, but I sincerely doubt it's American.