General Motors Proving Ground car show plaques
Updated September 28, 2026
| Lot number | 44 |
| Auction | Mechanic's Choice Auction |
| Date | October 11, 2026 at 7:00 PM EDT |
| Auction house | Inland Seas Exchange |
| Location | Pinckney, Michigan |
Group of nine General Motors Proving Ground Campus Classic Car Show plaques spanning 2005 through 2014, including the 7th, 8th, 9th, 10th, 11th, 12th, 13th, 15th and 16th annual events. Various colors and dates. Used condition with light surface wear and age-related marks.
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