Porsche just debuted a one-off 993 Speedster at Monterey Car Week ... just special models for Ferry Porsche, Jerry Seinfeld, and one as part of a factory restoration. Now, there is a fourth.

Jerry Seinfeld ... a 356 Speedster, and a 911 IROC RSR – all of them valued in the millions. But that's only the tip of the proverbial iceberg. Other Porsches from the Seinfeld collection ...