Scored this Ibanez SDGR bass a couple months ago.  The serial number dates it before 1990 but it’s  not been easy identifying the model.  Pickups, controls and output jack all suggest it’s a pre-1990 SR300 or SR400 but the flamed maple top and gold hardware toss this theory out the window.  I’ve seen a SR400 with a quilted maple top but it didn’t have gold hardware.  Either way, this is a great bass that plays and sounds better than all mid-range Ibanez basses I’ve tried.