I recently inherited a S&W model12 airweight from my father in law who was a retired police officer/dective.It appears to have a alloy frame and 6 round steel cylinder and and 2" steel barrel.Serial # is C7401##.Model# on frame when you open cylinder is 12-2.Minor spots where bluing has rubbed off due to holster wear.Any idea on value. How do you remove cylinder for cleaning.Thanks for your help.