All right TH44, where are the pictures?
Don't be holding out on us now...

I was thinking this Farq. would be good to guage the high end Gibbs sporter market but I think the chambering could hurt it. Provenance notwithstanding.
There have been some excellent cased match rifles sold at auction in the last few years in this estimate range but they have a bit different clientele. The market may be a bit softer now too.
My bet is closer to the low estimate.