Depends on configuration. Probably $4-$5K in a private party transaction, if it's truly 90% and a desireable configuration. Look at the Puglisi Gun Emporium website for comps. He usually has a good selection of nice Smiths, but at top prices.

I have been looking at a 12 ga Specialty. Asking is $1750, and I think it's a $1K gun because it's a 12 that needs some work. Smith prices are rising, and the new Houchins book will probably add to that.