See how different the finish looks on this alternator vs some of the ones posted earlier? That is my point. As with just about everything Mopar, one NOS example does not mean that every one ever produced looks like it. In fact, it wouldn't surprise me one bit if there were alternators installed that had no coating at all for one reason or another.

Mopar wasn't interested in all of their alternators looking exactly the same. Nor were they concerned about how long the finish lasted. If the darned thing didn't fail during warranty, they were satisfied. Mass production causes that.

I am really a bit surprised that people today say anything on our old Mopars would only have come one way. There may have been a finite range of possibilities, but almost nothing on these cars would have come one and only one way.