Rolex Yacht-Master II Regatta Chronograph Stainless Steel with Monobloc Middle Case, White Luminescent Dial with Blue Hands, Blue Cerachrom "Ring Command" Bezel (bidirectional 90° rotatable interacting with the movement), Screw Down Crown with Triplock Triple Waterproofness System, Superlative Chronometer Rolex Manufacture Self-Winding Movement, Oscillator Features a Paramagnetic Blue Parachrom Hairspring, 904L Stainless Steel Oysterlock Bracelet with Easylink 5mm Comfort Extension Link, 44mm.

The solid three-body case is polished and brushed with a bidirectional rotatable Ring Command bezel. It has a blue Cerachrom ceramic insert, with engraved numerals and inscription, and a scratch-resistant sapphire crystal. It includes the Triplock triple water resistance system. It’s an Oyster perpetual monobloc, 44 mm diameter middle case, with a solid screwed-down case back and Twinlock winding crown. The stainless steel is 904L alloy, and the dial is white with blue luminescent-insert hands and square hour index markers with red accents for the programmable countdown Regatta chronograph that has an "on the fly" mechanism. It’s water resistant to 100 meters (330 feet), and it has a small seconds subsidiary dial at 6 o’clock, and stop-seconds for precision time setting. It includes a COSC (Certified Official Swiss Chronometer) certificate. The case, dial, and movement are signed.

This Rolex Yacht Master II 116680 has a mechanical automatic self-winding Rolex caliber 4161 movement. It’s rhodium plated, and it’s constructed with a straight-line lever escapement, a Paramagnetic blue Parachrom hairspring, and it self-winds bi-directionally via a perpetual rotor. The mechanism oscillates at a frequency of 28,800 vph (4 Hz).

The start/stop pusher located at two starts and stops the countdown. The reset pusher located at four has three functions: programming, synchronizing, and setting the countdown.

With one hand, the user can rapidly program the countdown. Likewise, he can start, stop, set, or synchronize it, while it is in progress, to the official countdown with a simple press of a pusher. To time the start of a regatta, press the start/stop pusher to start the countdown. At the end of the countdown, the minute hand stops by itself at 0. The seconds hand continues to turn. If necessary, to synchronize the countdown, at the time of the official signal, sound or visual: press the reset pusher briefly and firmly. The minute countdown hand repositions itself to the nearest minute, while the seconds countdown hand returns to 0. When the reset pusher is released, the minute countdown hand and the seconds countdown hand are automatically activated. To stop the countdown, press the start/stop pusher. To set the countdown, ensure that the countdown is stopped. Press the reset pusher. The minute countdown hand returns to the minute programmed at the last setting and the seconds countdown hand returns to 0. The countdown is ready to be started. To program the countdown, first, ensure that the countdown is stopped. Turn the bezel 90° counterclockwise. The inscription Yacht-Master II should be aligned with the winding crown. This locks the start/stop pusher. Press the reset pusher. A click is heard. The pusher remains depressed. The winding crown is then unscrewed to position 1, without pulling on the stem. (The same as for manual winding). The hand is positioned at the desired minute by turning the winding crown in the winding direction.

The minute countdown hand moves from 0 to 10 minutes by increments of one minute. At 10 minutes, if the user continues to turn the crown, the hand returns to 0. Return the bezel to its initial position by rotating it 90° clockwise. A click is heard. This returns the reset pusher to its initial position and unlocks the start/stop pusher. Push and screw down the winding crown. The countdown is ready to be activated according to the time programmed.

The only chronograph in the world with a mechanical memory, the Yacht-Master II with its bezel acting as a programmable countdown, is an essential tool for skippers to gauge their best course of action. 

Synonymous with excellence and reliability, Rolex watches are designed for everyday wear and depending on the model, perfectly suited for a wide range of sports and other activities. Built to last, these timepieces are characterized by their distinctive and timeless aesthetics. The Oyster Perpetual Yacht-Master II is a unique regatta chronograph.