This gun looks like a gun made by W.C. Scott to me. About the same grade as an excellentia or monte carlo B grade.

Both of those guns in this condition would be in the $6000-$8000 range so I'm going to say $3800-$5800 for this obscure maker. The quality of the gun certainly exceeds the named maker, but there just isn't much demand for obscure maker's work. If it said Grant, Dickson, Lang, or even Scott on it we'd have something of much greater worth.