Unlike Browning and others, Ruger doesn't do the "grade" variations.  Some distributors and retailers have had non-cataloged models, some more recent ones would have different wood and a more polished finish.  No "grade-___" models though.    I do recall the a few that had floorplate engraving but can't recall if they had the Ruger eagle specifically.  Could've been something added after leaving the factory also.  There's also Baron Technology...