Finally got into my gun safe after 10 years (see my other post) and would like to sell my Colt Python 357 mag CTG. Its blue with a 4 inch barrel. Serial number V076XX. Looks like its a 1959 gun, three years older than me! Like new condition. I see prices all over the place, how do I come up with a value that is fair to me and the buyer? Thanks from upstate New York!