In 1966, Ford partnered with the Hertz rental car company to give travelers something a little more exciting than the usual American sedan — the Shelby GT350-H Fastback. But it wasn't people on vacations and business trips that rented them. Affectionately known as the "Rent-a-Racer," many of these GT350s ended up on the track at race weekends, coming back on Monday with bald tires and evidence of roll cages being welded in. With around 1,000 produced, the car is rare, even by Shelby Mustang standards, but this particular example is even more scarce with its Ivy Green paint instead of the typical black. It crosses the auction block at Barret-Jackson June 21-24.