That's actually a Pedersoli "Frontier" model. You omitted the caliber in your post. They are sold by Cabela's as the "Blue Ridge Hunter". The asking price is $100 off what they sell for new (and not including shipping) The sights are modern in your photo, so you will need to swap them out for a good, plain rear sight,
https://www.trackofthewolf.com/Categories/PartDetail.aspx/880/2/RS-FG-16-T this is a finished sight, or you can go for really basic and shape it as you need for elevation and notch
https://www.trackofthewolf.com/Categories/PartDetail.aspx/880/1/RS-B-1. The front sight on these rifles really needs to be thin to get the most out of the accuracy. I like to use a thin, tall, silver, front blade as it can be reduced for your favorite distance, and the silver picks up light well in low light.
https://www.trackofthewolf.com/Categories/PartDetail.aspx/874/6/FS-TC-TTB. The last thing to know is they have a patent breech, so you will want to get a .22 or .32 caliber bore brush for a pistol, for the end of a modern ramrod to be able to keep the breech clean. Check the bore to ensure it's in good condition. The .50 and the .45 caliber versions of this rifle are 1:48 twist, so if you like to shoot conicals as well as round ball, you should be able to get Lee REAL bullets to work well for you. The .54 is a 1:65 twist, and prefers round ball.
LD