Cool ad...I wonder which one it was?.
According to the list Penske sold 3 of the 69 ZL1 cars built...one each of Cortez Silver, Hugger Orange and Fathom Green..
VIN 609462 (#17)
Ordering Dealer: Gibb Chevrolet, LaHarpe, Illinois
Selling Dealer: Roger Penske Chevrolet, Philadelphia
5M21 4-Spd Close Ratio Transmission
5912 69-69 Cortez Silver
VIN 609856 (#25)
Ordering Dealer: Gibb Chevrolet, LaHarpe, Illinois
Selling Dealer: Roger Penske Chevrolet, Philadelphia, Pennsylvania
5M40 Turbo Hydra-Matic Transmission
5927 72-72 Hugger Orange
VIN 618396 (#44)
Ordering Dealer: Gibb Chevrolet, LaHarpe, Illinois
Selling Dealer: Roger Penske Chevrolet, Philadelphia, Pennsylvania
5M21 4-Spd Close Ratio Transmission
5920 57-57 Fathom Green
~ Pete