I have a friend who has a old Weatherby 300 Magnum Mark 5 that has barely ever been used. He is thinking that it was made back in the 60's. It is a really beautiful gun. I believe it had a Redfield scope on it. Does anyone have any idea what kind of value it would have? He is thinking of selling it, but I have no idea what a good starting point would be for him. Any advice would be much appreciated. Thanks.