My father just recently gave me this revolver and I was wondering the value of it. Correct me if anything is wrong guys. Dan Wesson Arms model 715 with a 6" vented barrel and adjustable sights. I know the gun is 25+ years old. It also has Monson Mass. on the side of it. From doing some research on here that increases the value of this gun. I thought the ruler would help judging the size.