Now For Something Totally Different!
I had a nickle M58 from the mid-1970s. It was LNIB, but the workmanship was so poor that I sold it. I later came upon a nickle M58-1 "classic," which is flawless, so I bought it. It has a forged, not MIM trigger (the trigger is not "hollow" on back and I can see the tooling marks), but it does have a MIM hammer. Aside from the IL, which I hate, the workmanship, including the fit, finish, polish, timing, B/C gap, everything, is absolutely first rate. I am sharing this because, as with any mass-production item, perhaps it is not so much the era of manufacture but more the "luck of the draw" as to whether we get a lemon or a winner. Just a thought.