jdm, I do remember this longrifle being from, or found in, the Maryville, TN area.
The single and most notable feature it shares with the attributed Robert Hughes #197, in Bill Ivey's collection, is the side plate, which is rather unique. There is also a marked similarity in the design of the trigger guard. In all other respects, it is, I believe (being no expert) a TN rifle.
I think it stands, in evidence of my previous remark about builders of the mountain schools rifles adopting crossover regional styles and features to their own local and stylistic preferences.
Thanks for offering your your photos, to the discussion. Simple as these rifle appear, there are some few of these rifles whose architecture and worked iron fittings, can't but appeal to and capture our attentions.
I purchased Bill Ivey's book and was so impressed with the attributed Robert Hughes piece, that I had Chuck Edwards plank build a NC rifle, influenced by Ivey's #197 and evidencing some TN influence, as well. He's known for his iron work and exceptional engraving and builds a solid longrifle.
