Prices are always a subjective matter, often influenced by personal likes and dislikes, what a collector prefers to collect, etc. This rifle is hard to estimate for a price range, because we have not seen better, more compete images. An issue is whether the barrel has been shortened or not. The rear sight is still in a decent position and distance out from the breech, and I cannot see a moved pin hole in the forestock... so is the barrel original length, or has it been shortened a bit??? Makes a difference in what it's worth.
I like the touches of silver work, particularly the detailed man-in-the-moon inlay in the butt... and the little oval and teardrop inlays that give the gun a little more character than just a plain-Jane half-stock. The capbox, while a somewhat standard shape, has the nice touch of the maker's mark inside it. The guard also has a more pleasing shape than many later guards. So in my opinion, the gun is probably worth a little more than the average, undecorated 1850s half-stock because it has more eye appeal. I'd probably stick another hundred on the earlier price estimate.
Shelby Gallien