Just found this pic on an old hard drive which is Slade back in 1977 after getting equipped all round by John Birch. Jim has the original version of his bass which went back into Birch's a year later for a lighter refin & to get rid of the switched pot next to the overdrive. The Magnum pups were switched to Superflux's to get more high end out of it when soloing.
It came back looking identical to Scott's.
Dave "J1" had fart oo many knobs for sanity, one of them was an onboard treble booster, I think the other one was a sustain.
Nod has a 1961 SG Junior with a John Birch Magnum & JB bridge. It was stolen off him 3 years later after a gig.