Well, I don't know the rules for this board about buy/sell postings, but there are several web sites that can help you. I'd start with posting pictures and asking for expert help on condition and value on antiqueguns.com.

Don't expect to retire on the proceeds if you do sell, because it is not a rare long arm from the era. It likely has a value less than $2000, and maybe significantly less if in well used condition.

Good luck.