well I don't think they're too common and that they are very old. Hold onto it and don't clean it unless you check witha gunsmith, it could ruin any value it may or may not have. They are an interesting piece to have.
PS if it says where it was made or the year that'll help that experts that are sure to come
"I only regret I have but one life to lose for my country" Nathan Hale
Amendment 2 - Right to Bear Arms. Ratified 12/15/1791. Note
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.