I at one time had the prototype of that knife with PROTOTYPE on the blade. Old style ridged scales and CPM-154 DLC. It was the same configuration as the first run version. It wasn't the polished micarta ZDP version unfortunately because I would have been very tempted to keep that one! I returned mine to its rightful home on Teton Avenue and received some prototype Blur stuff in return. I probably seemed a bit pushy but didn't want to just give up something as rare as a marked prototype but received far more than I could have even imagined in return. The prototype Blur handles I posted pictures of previously came out of that trade.
These are really neat with the stud lock. I've still got the Sandvik black G10 version, a Ti Bump, and 2 versions of the bigger brother the Offset which also share the starburst pattern handles of the later runs of the Spec Bump.
As far as released versions, Bob nailed it with the 11 as far as I know. For collectors, I know there are a number of prototypes that never made it out as production versions like that ZDP version and a pink/purple Ti bump and as far as I know they have never been seen in the wild only in pictures that Thomas posted many years ago. So probably no need to try and hunt those down like those elusive purple Blurs that are out there somewhere.