Often pushing technological boundaries, Richard Mille made a perfect partner with similarly performance-focused Ferrari. The first product to celebrate their partnership isn't merely a stock timepiece with a Ferrari logo; it's the thinnest watch in the world. The Richard Mille x Ferrari RM UP-01 measures just 1.75 mm thick, and was the result of years of R&D. Unlike many ultra thin watches, it does not use the caseback as a baseplate, instead retaining a traditional architecture with a clever movement and patented escapement co-developed with Audemars Piguet. A function selector sits in the upper left, allowing the crown below it to wind the manual movement or set the hands, with the rest of the watch taken up by the dial, Prancing Horse detail, and a window that allows the remarkable movement to be seen in action. Limited to just 150 examples.