If it is in really good shape, I think you could ask $1,200-$1,400 for it, but that may be optimistic in today’s market. During the pandemic, it seemed people would buy anything and sellers could just about name their price. I think a lot of that was due to “panic buying.” Things have simmered down considerably since then.
The gun in the photos looks a lot like the “trade rifles” Clay Smith used to make, except he used an early-styled trigger with a pigtail curl. I don’t know whether he is still making these or not. Smoothbores seem to be all the rage now. Anyway, Mr. Smith built these as entry-level rifles around a precarved stock, but he was still asking about $2k for them 7-8 years ago. I thought that was a lot, for a plain rifle with a straight-sided barrel and precarved stock, but these rifles carried a premium because of his reputation as a builder. Your rifle, regardless of condition, would be considered “used,” and if there is no indication of who built it, that would limit the top end of its value. However, it does have good quality components and from the photos it seems to be nicely built.
So, I would estimate $1,200-$1,400 but you should probably be prepared to accept a good bit less. You may also want to consider some other people’s opinions or estimates, as I am no expert.
Good luck to you.
Notchy Bob