Does it have Target style stocks? 58s all shipped with Plain Clothes Magnas with the rounded bottoms. I believe the only other model that came with square butt N frame PC Magnas was the later M520 357s
Even if they’re not original to the gun you did well if they’re actual Cokes. They could be worth enough to sell and buy you another decent shooter grade S&W.
I’d be interested to see the long barrel. I’m guessing it was a M57 barrel with the front sight shortened to work with the fixed rear? Interesting gun sounds like.