Wonderful! Whatever you do, DON'T try to clean it up or "fix" anything on it!!! Leave it exactly as it is! Maybe blow it off with compressed air, but I'm not sure I'd even oil anything until I had it appraised.
And you should get a small wooden dowel rod, gently slide it down the barrel until it stops, mark the rod at the muzzle, and then compare the dowel rod to the outside of the rifle, with the mark at the muzzle. So you can detemine if it's loaded or not. It's very possible there may still be a powder charge and ball in that thing after all these years.
If you line up the mark on the rod with the end of the mzzle, then see where the other end is at, that'll give you an idea how deep the barrel is. If the dowel rod goes past to the flash hole, I'd wager it's safe. But if it stops very far away from the flash hole, I'd handle it very carefully! There's a lot of other guys here way smarter than me about this, I just thought I'd mention this as a warning.