Yeah, just looked back and the tone pot begins with 304 as opposed to the other two which begin with 137. All 3 are ‘66 but there is a theory that not all 3 were fitted in Fullerton.
Both types were used by Fender, that’s all I know.
Thanks mate. It’s an amazing bass. Yeah it’s all original. The pickups say 1967 but the rest of the bass is ‘66.
It’s got the Entered Special routed behind the scratchplate and the pots are original and untouched but different to one another. I’ll check back on the “internal” photos and let you know. It’s unusual, I know that much.