It looks like someones upgraded the rectifier with an aftermarket universal one. No reason why it wouldnt work ok as its only taking the a/c and converting it to DC to feed the electrics. It probably got better control over the output that the old one as the shunt-windings of the regulator on the OEM can be hit and miss after 40 years, compared with a buck-converter Solid-state equivalent on a modern type.
