According a post on the TS site:
"Yes they have been around awhile. There are 50 out there that were personally signed by Carroll Shelby and came with Certificate of Authenticity. The original program was to do 100 of the signature models. Carroll signed the first 50 certificates and plates. He then passed away and the last 50 were never done. Even though the certificated and registration plates say # XXX of 100, there are actually only 50. I have # 49."
Expensive CS signature item. But, then, like its protagonist, it has balls.