I would answer both questions by saying: I don't know (twice).
But I would add that, as to its worth, I'd take it to an antique gun dealer and have it appraised.
As a DIY project - assuming it's not worth much - do you plan to shoot it? If so, I'd have it looked over by a gunsmith who's familiar with antiques, to be sure it's safe to shoot. AND, it's my understanding that you'll need to have it on FAC.
Jim