Do you mean the M3 Edition 30 Jahre? The 30-year-anniversary model?
There is no "which one". BMW very deliberately identified all of them as "1 of 30," meaning "an unspecified member of a group of 30." They eschewed serial numbers (i.e., "#1 of 30", "#2 of 30", etc.) in part to prevent collectors from attaching greater, artificial value to certain cars in an already severely-limited edition.
A forum community dedicated to BMW owners and enthusiasts. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Bringing the BMW community together.