Re: ID required
As a "collector" gun, it has little to no value. The guard is broken, the barrel has been cut, and it's rusty as hell.
As a "shooter", it would probably be dangerous to shoot. The gun was made long before smokeless powder was invented (about 1874), and is made of iron, not steel. Shooting smokeless in it would be right up there with lighting the fuse of a wet firecracker and holding it. For a while nothing might happen, but eventually one will explode in your hand. And as for shooting it with black powder loads, by the look of it, it does not seem to be well taken care of, and I would be afraid to try it.
As a "shadow box gun" for a display, it might be worth a couple of hundred bucks, if it is a "real" one. If it's one of the copies, then maybe worth 50 bucks.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.