Hey Rocketman, i came up with this in another post and wondered if it was literature based. Now that i learned you sorta invented this system i would say really good job since this is a good way of determining gun values based on basic factors. Though i completely understand how this works, i only have one question in mind. There were gun retailers in England such as Army&Navy and they were ordering other gunmakers to make their guns. As far as i know i can count Westley Richards,Greener,Vickers,Hodges,P. Webley, Webley Scott and some others. Since the guns were made by different makers, is there any way of classifying for ex Army&Navy shotguns as brand name value or is it simpy BV3?