According to the 2016 version of the Smith & Wesson Standard Catalog - 4th Edition, a blued Model 59 ANIB is worth about $750. $600 in excellent condition, $500 in Very Good condition, and $350 in Good condition. I own the same model and absolutely love it. It was passed down to by my late uncle who was in the Navy. Great shooter, and a nice solid pistol. Unfortunately for me, the one I own has been used quite a bit and is pretty beat up (however still to this day performs flawlessly), so mine is most likely only worth between $200-$250, But doesn't matter, I'll never let this baby go! If you haven't already, you should get your hands on it if you can. You will not be disappointed.