That would have been added by me... It was originaly a regular black RG, 2 humbuckers, 2 knobs, 5 way switch. Since I have two of them, I wanted something diferent (read: less versatile) for this one, so I had the pickguard installed along with the green bkp and single knob.
edit: the green thing started with this: Steve Vai's 1990 UV7BK http://en.wikipedia.org/wiki/Ibanez_Universe