Shelby is a name synonymous with special edition Fords. Carroll Shelby started tinkering with Fords in the 60s and his flavor of work was so well received that his cars became instant hits. He was responsible for the V8-powered Shelby Cobra, but also worked on cars like the GT40, Daytona Coupe and of course the cars he's most well-know for, the Ford Mustang. The 60s Mustangs bearing the Shelby name are becoming increasingly rare, collectible, and valuable.

In the 60s you could buy a few different variations of Shelby-tuned Mustangs, all of them limited in production numbers. In 1968, and only in 1968, the Shelby GT500KR was built with around 1,000 of them reaching the streets. As you can imagine, a car fitted with a large 428 Cobra Jet that churned out 335 hp with 440 lb-ft of torque wasn't going to stay on the streets, many were written off in the first few years. This just meant the remaining cars would become even more valuable, and after Shelby's death in 2012, the cars still bearing his signature became more sought after. We're talking old school here, not the new generation of Shelby cars from 2004.

This recent barn find '68 Shelby GT500KR (KR is for King of the Road) is in excellent condition.A truly rare find. According to the eBay listing, the car is unrestored with the original drivetrain and matching numbers. There's all of the paperwork from day one and details of the three owners. The car has a documented 64,000 miles on the clocks too. The car has been featured in magazines and is part of the Shelby registry. The most important bit is the tag inside the glove box that was signed by Carroll Shelby. At the time of writing, the bids are at the $51,000 mark with the unspecified reserve yet to be met.