Definitely honed plenty. The proof marks were used between 1875-1889. The serial number will give a precise date with investigation.
I'd really measure wall thickness from chamber to 18" out where it really counts. Someone honed out a lot of pitting and we want to make sure you have enough thickness near the breech to determine it is safe to fire with low pressure 2.5" shells.
Don't fire it until you establish it has enough metal!
P.s- Scott's are lovely guns. Yours is a utility/field grade and nothing to scoff at.
