Afaik it is all original apart from the whammy bar screw. The toggle is unlike any I've seen, so it may be after market. The pots are hard to read for the solder but I think I've got 1376529, which puts them at the 29th week of 1965 according to the dating site I tried. The pups are patent sticker.
Supplementary question. The reason I opened this can of worms is because my beloved SG stopped working. When I opened the control cavity I found a loose wire. Damned Gibson qc, haha. What lug do I solder it onto? It's the lead not the ground. The guitar works with whatever log I touch it too, which one is the right one? Given that it is a three pick up guitar. Thanks