Without a snapshot, it's gonna be tough to assign a value. However, if the finish is original and the stocks are correct, I think you wouldn't get hurt at about $300. But I wouldn't pay more unless you really liked the gun because you are getting close to the retail number. Get the box, tools and or papers and you can add a few bucks.

Oft times what looks like pitting can be removed and leave little indication that it was ever there.