Good Day! I’m very new to forums and civil war muskets. I was gifted an 1863 US Springfield rifle. It has 1863 on barrel however 1862 on lock plate. Is this possible or is maybe the lock plate not original to the rifle? I believe it is a type 1, as the barrel bands are held on by screws and not the barrel springs. The side plate screws were loose, however when I tightened them, you couldn’t move the hammer. So I backed them back out a turn or so. There is lots of pitting on top of barrel that seems to match the lock plate. I’m just trying to figure out if I have an original or if pieces were replaced. Thank you for your time!