With the exception of the 1995 Ford GT90 Concept, which was unfortunately pulled from the sale, the highlight of RM's Arizona auction this year was undoubtedly the 1964 Shelby Cobra 427 "Flip-Top." The car served as the prototype for the legendary 427 Cobra, and is the only Cobra to feature a clamshell design. It's also quite a beast of a car, with the 427-cubic-inch V8 pushing out 623 horsepower. Without a doubt, it commanded the entire room's attention when it drove onto the block.
Although RM didn't list an estimated price, we fully expected the car to reach into the seven figures. The Flip-Top Cobra doesn't exactly have a legendary racing history, but any one-off 427 Cobra is worth gobs of cash in our book. Bidding quickly passed the million-dollar mark but ultimately stalled out at $1,450,000. It wasn't quite enough to meet the reserve price, so it looks like the Flip-Top will be staying with its current owner for now. You can read more about the car and its history in the description from RM Auctions after the jump.