Well, you know Ibanez is hardly my specialist subject, I could most certainly be wrong! :lol:
But I have a couple of '80s catalogues with the early RG, Radius (JS-style), Power and Saber models. They made a big thing about the thinness of the Saber/S body, and it's the only one with that black plastic bit - it just looks like it's there to raise the switch up an extra couple of mm.