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I believe these were just the blued version of the 686. I'm sure someone will correct me if I'm wrong. I handled one this year in a store. Nice condition, no blue wear or major dings. I think they wanted $550.
586 was likely only made in 4", 6" and 8 3/8" barrel length. I have owned several and they are usually accurate and pleasant to shoot. They used to sell for about $100 cheaper than the stainless versions.