That serial number does looked slapped on as an after-thought.maybe someone had this as a ninteys guitar and wanted it to be maybe a more valuable 80's? Just throwin it out there.
If you take it apart and look on a part (pot, selector switch, bridge) for a number and go to the Ibanez web site go to the and look for the parts log in and then do a search for that part and the should tell you for what models they used that part on.