My favorite LGS South of Seattle sent me a text concerning this guy a week or so ago. I stopped by when I was in town and picked it up. Six-inch, Nickle, no dash, no "M" M586. SN ADM71XX puts it in 1984. I got it for $550.00 plus the states cut. It was wearing "Goodyears" in the case I had a set of "K" frame targets in the stock box at home. I put them on it (don't think they're quite correct). Looks a lot better! Here are a couple of pics.
De Oppresso Liber
De Oppresso Liber