18. Ford Mustang One Millionth Anniversary
In 1966, just a year and a half after the introduction, Ford sold the millionth Mustang. That was a fantastic achievement, even by today’s car manufacturing standards. It seemed like Ford just couldn’t build enough cars since the demand was massive. To commemorate the occasion, Ford built 50 Mustang coupes.

All of them came with special gold paint with deluxe pony interiors and lots of optional extras. Lots of mysteries surround those cars and few are known to survive. However, it looks like each car went to one sales district in the mainland U.S. for either display or sale.