Carroll Shelby’s great experiment just became the most expensive American car sold at auction.

A lot of great cars went up for auction at Pebble Beach this past weekend, but arguably, this was the most historically important of them all. It’s the very first Cobra built by Carroll Shelby, which was used both as his personal car, and for magazine testing in period. In other words, this is the very car that shocked the world back in the early-1960s.

This car, chassis CSX 2000, sold for $13.75 million including auction fees at RM Sotheby’s Monterey sale, reports CNN Money. Not only does that make this the most expensive Cobra by a vast margin, it’s also now the most expensive American car sold at auction. Given its history, though, it’s kind of a surprise it didn’t sell for more.

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