I agree on the $100 price range. I have in my possession, (holding for a friend while he goes through some legal stuff), an 1861 with full wood, all original, rifled barrel that he paid $125 for. He could probably double his money, but not much more. I have seen VG+ ones with original parts and matching numbers got for $1000-$1200 or so.
there is no 1861 sniders all were made after 1865 the date you are seeing is the date on the lock that came from a p1853 Enfield rifled musket with full wood and in decent shape its worth $500+
I stand corrected on that. I admit, I don't know much about them. I don't think this one is worth the $500 mark. It is at best fair shape. Mechanically, it is in good shape, but the lock and barrel has surface rust. One barrel band is tightened as much as possible, but the wood has shrunk, so it moves when you handle it and the ram/cleaning rod spdoes not screw into the stock and is kinked on top of it. Probably make a decent shooter, though...