It may get a few more bids if there was a picture of a chamber casting and some measurements. I would talk to my aunt and see if I could play with it for a while if it turned out to be chambered in something new to me. Maybe, give her a resonable starting bid down payment with any balance when it goes to auction later?
If the execution of the lever would be a potential stumbling point in the market, then probably the stock fit and engraving execution would also hold the rifle back, maybe not purely the style. It looks like a local smith was given a little reign, and not a top tier conversion. It'll work out.
If aunt didn't care what she gets for it, I think a thousand or maybe twelve hundred is a thought through starting point for an auction, likely without the scope. Then, the only thing to hope for is if two or more bidders see something interesting. I think it's a shooter, and doesn't look like it has inherent collector value?
