ManicBeatle

Thanks. Not a modification. Spoke with the previous owner who explained it was a factory special order blender pot (sort of master volume) to allow the guitarist to dial in more or less bridge or neck pickup (while in the center position of the selector switch). Pretty cool...

I can't add the other picture unfortunately... I hope someone can help me with this.

Hello all. I have a 1967 Epiphone Casino that has an electronics configuration I have never seen before. It has an extra pot on the treble horn, in addition to the normal neck and bridge volumes and tones, three way switch and jack. The pickups are P-90s. I am 99.9% sure the extra pot (same correct codes) and hole in the horn (perfectly clean and like the others in the body) are factory OEM, but I have several of these guitars and have never seen anything like this. I don't know if the extra pot is a tone or volume, and I don't know why it would be on this guitar. Has anyone ever seen a Casino or ES-330 with this configuration? Can anyone point me to another model with such a setup? Does anyone have a wiring diagram showing this on any Gibson or Epiphone guitar? The only thing I can think of is the fifth knob on a Rickenbacker 325 or maybe a Gretsch configuration? Dunno! Here are pictures of the original wiring, which I don't have. All I have is this picture. I'll try to add pictures of the bare body as it is today and as it was originally too.. Thanks a lot for your advice!