And the winner is......... B.Waller. It's an old Prestolite. I bought a bunch of NOS Prestolite ignitions from a guy in Oregon who used to have a shop, he warned me that they were pretty crappy and he wasn't wrong, but if yours is still working, that's a bonus, as they were certainly at the "lower scale" of quality electronic ignitions.
From memory, you need to be mindful of the air gap between the rotor and the pickup, Prestolite used to supply a thin plastic "feeler gauge" (and they stressed that you musn't use anything metal) to set the gap. Cheers, Terry.