I traded a 4 inch blue with factory target stocks in 98% condition a couple months ago for $900-$1000 trade value. Pictures are a little fuzzy but even with the Hogue grips I'd expect to find yours priced at $800 or more where I shop. I'd negotiate from there depending on overall condition and how the finish looks under the Hogues; sometimes corrosion has formed under the rubber grips and can be pretty ugly. I don't see a lot of nickel 586s. Good luck.
Jeff
SWCa #1457