This is why I recommended that he switch to an alternator that is internally regulated. External regulators are getting harder and harder to find.
That’s part of the reason that if I can adjust it to work right, I want to keep it.
I’m not all bugaboo about keeping things original, but a big part of this process for me is knowing how things were designed and how they work. (or are supposed to work!)
And as far as I can tell, it is the original regulator.
Looks exactly like the pic in Toboldt’s book.