I am getting information on my dads gun that he has owned for a really long time and was wondering if someone can give me information on it like the year and value of the gun. I know my dad has never shot the gun as long as he has owned it. Anyway it is a model 586 357 Magnum Revolver with a 6 inch barrel. The serial number starts with AAL and that’s About all I know about it. Hoping someone can help me out and let me know the year and value of the gun. Thank you!!!