Here is a pretty good photo of the guitar one of you was referring to.
It has a "deluxe" roller string tree, blue/silver/red lace sensor pickups, and that replaced tuner is a Hipshot D-Tuner with a lever for switching the tuning for the E String. It is an early 90's 57 Re-Issue Stratocaster. It started off as a 2 color sunburst, then had silver paint, and bat, spider, and other stickers applied, which have since mostly worn off. Billy covered the entire pick guard with black sharpie marker, which has since worn itself off from use.
It was his main AXE from the time his Gish Strat was stolen (Early 90's) to the late 90's. Used heavily for touring, and recording several songs on Siamese Dream.
You can see the guitar new with its sunburst finish in videos from 1992 like the Reading Festival
You can see this guitar with fresh silver paint and stickers on their 1995 SNL performance
And then by 1996 he had it worn down to this point.
