Re: Fernandes guitars from 90' :)
My guess is the USA Custom refers to it being made in the US factory out of LA that was opened in 1992. As for the bridge, it looks like a Fernandes licensed Floyd pro. I can't say whether it's better or not without playing it, but my guess would be that you would want to get the measurements before dropping money on a replacement after-market trem from Ibanez or OFR.
The pickups, at least the neck, look like they're Fernandes. Although usually a humbucker, there is a Sustainer as a single coil, this pick-up looks like it has the logo on it. The mini-switches also point to a Sustainer since you wouldn't need 2 for a coil tap or something like that. I can't say anything about the other pickups.
That's about the best I can do on this particular guitar.