As far as Sanctioned 900 Series goes, the current number is indeed 7. However, I believe that Glenn Allison got ripped off back in 1981 when he rolled the first one, only to have it disqualified by something that was beyond his control. So, in my "opinion", there have been 8 900 series rolled, but only 7 of those got the gold ring. By the way, the lane conditions that were in effect back in 1981 when Glenn Allison rolled the first 900 series WOULD have been legal by today's standards, but they weren't by the standards in effect in 1981.