The stock looks good to me, but it appears like new wood has been added above the nose of the lock, and above the lock plate behind the breech. The front sidefacing's rear end has sharper than expected edges, but the wood looks OK and it may have been reworked a bit when the two splices were fitted, smoothed, and finished.
If I were guessing where this rifle came from, I'd think western PA with its commercial "key hole" style patchbox and moderate barrel length. The side plate is odd, with its two little "horns" that stick up along the top edge. It almost looks like a later replacement for a smaller, simpler lock bolt washer with its color variation from the brass guard, and its seemingly smooth, almost unblemished surface that sits pretty high off the original surface for a percussion rifle.
Shelby Gallien