Lately I put a
Roadstar Series neck on one of my 540Rs that says "Roadstar Series" on the headstock. Great neck BTW. In the photo of Joe in the liner notes of Dreaming where he is kicked back with boots on the table and his guitar sticking up in the air you can see the same Roadstar Series logo on the headstock of that guitar (can't read it actually but it's surely the same).
That got me looking more closely at the body of the guitar. It's the one with all the silver marker drawings on it. That guitar is a HH configuration on a Radius body with the
pickup selector switch in between the control knobs like on the current JS models. I have a HH 540R and the toggle switch is not in the same place; it is up from the volume knob, closer to the neck. Did Ibanez have any models with the switch in the location of Joe's guitar at the time?
Theory:
Joe got the HH guitar and liked it but didn't like where the selector switch was so he moved it to between the knobs. The patch job on the original hole showed so he got around to noodling on the guitar with the marker to cover up the old hole area. Then the guitar just ended up covered in marker. Later, Ibanez made the guitars to his specs and put the toggle switch where he wanted it in the first place.
And, if Ibanez didn't even make a HH radius guitar at the time perhaps he had the middle single coil hole of a regular radius filled in and the neck single coil hole routed for a humbucker. Again, the silver marker was used to cover up the finish defects from the filled middle position.
Hmmm....