Nobody really should be taking offense to the suggestion that this was a mutt/ parts guitar. That's actually one of the more likely possibilities when an oddball like this shows up.
A couple of things that stand out here.
I know you guys are hoping it's some rare MIJ prototype that's worth it's weight in gold but...
The body has MIK contours.
The bridge routing does not fit the typical MIJ bridges & is indeed recognizable to me as a factory FR2 route (more below)
Those are not V series pickups. The pole pieces are different, as well as the bobbins.
The
Schaller tuners are not something Ibanez used... (see below)
The contour of the back of the headstock is not typical for any MIJ RG neck.
The
locking nut does not appear to be Ibanez but FR.. Ibanez's nuts of the peroid has more sloppy fitting clamps than that.
Neither of the posters who say they have one are in the U.S. so we should be looking at old catalogs from europe etc.
Now for my opinion on what it could be... (&why)
An early MIK Ex series marketed only in Europe.
The main reasons I suggest this:
The Schaller/FR hardware
The shape of the contours on the body & neck.
& most importantly the fact that throughout the 80's I worked for a company that imported nearly the exact same guitar.

It would be exact except for VERY subtle changes in the shape & of course the brand name on it.
This IMO was built in the same Korean factory as the old Kramer Strikers & Phantoms etc.... I easily recognize the type of routing & painting techniques like it was just yesterday.....It was my job to do the setups/repairs & nearly every one needed fairly major work after spending 3 months on a container ship so I saw the insides of litteraly thousands of them. That factory also had deals with Schaller for bringing the FR2's & tuners into Korea to be installed on thier production guitars of any brand they produced for a fee.
So in summary I suggest it's a MIK Ex/ RG that appears to be original.