More than 35,000 hours of development work were put into the exclusive driving of the Yacht-Master 2. Introduced in 2007, Rolex’s regatta chronograph was initially powered by Caliber 4160, the new caliber arriving with the stainless steel variant introduced in 2013.
The Caliber 4161, which consists of approximately 360 components, is based on the Cosmograph Daytona Caliber 4130 and offers the following performance features:
- Automatic mechanical movement
- Regatta chronograph
- Winding in both directions
- 28.800 A/h
- 42 jewels
- Power reserve: approx. 72 hours
- Accuracy -2/+2 Seconds per day
- Diameter 30,5mm
The special feature of the Yacht-Master 2, its adjustable countdown with mechanical memory and flyback function, provides a very innovative interaction of bezel and movement. Even though there is usually no connection between the bezel and the inside of a watch, this separation is lifted in the Yacht-Master 2. Its ring-command bezel is mechanically linked to the caliber and serves as the trigger for the sophisticated countdown mechanism.
This video is a clear demonstration of how the Yacht-Master 2 countdown works: