In the car world, what does really qualify as rare? And does rare always equal collectible? On the list of ultra-rare cars that also carry great appeal to auto collectors, there are few models that ...

In 1969, Corvette only built one ZL-1 convertible, and it was never intended for public sale. Now, the ultra-exclusive Stingray is expected to hit the auction block next month for the first time ever.

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