Until now, no one has developed a production wristwatch with true retrograde linear displays. Urwerk’s UR‐CC1 achieves this feat. It has two horizontal indications displayed by www.jemontre.net/hublot-c-9.html two retrograde cylinders: one for the (jumping) hours, the other for the minutes. The watch is the result of more than three years of research, development and testing to ensure that the rotation and instant fly‐back of the large hour and minute cylinders is achieved without compromising accurate timekeeping.

A vertical triple‐cam operating a toothed rack (visible through a window in the side of the case – see image below) rotates the minute cylinder. From zero to 60 minutes, the minute cylinder rotates through 300°. On arriving at the 60‐minute mark, the cylinder reverses back to its original position in 1/10th of a second thanks to an extra‐flat linear spring. The retrograde movement of the minute cylinder triggers the hour cylinder to advance (jump) one complete hour.

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The triple‐cam is crafted from bronze beryllium, a metal selected for its inherently self‐lubricating properties and low co‐efficient of friction, and takes the form of three small inclines. The precise shape of the curve of the incline is relayed to the pivoting rack, while the teeth on the end of the rack mesh with and rotate the minute cylinder. The triple‐cam makes a complete rotation in three hours so that each of the three inclines takes 60 minutes, and 180 points of reference have been calculated on each of the three cams to ensure the precise and isochronic rotation of the minute cylinder.

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