This is a seventies' Strat which should be all stock (though the pickups do seem a bit strange to my unexperienced eye... non-staggered polepieces). But look at this pickup configuration mass / negative pole - all three pickups are going to a 330nF capacitor, and then to ground. The rest of the wiring, upon a brief survey, appears stock.
It should not even work, maybe. But the owner (a great guitar player) swears by it - more sustain and a sort of compression unobtainable in any other way, says he.
What say you? Have you ever seen that kind of wiring?