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Sticking with undersea operations, the Oris ProDiver collection is an interesting one, given that Oris is one of the few watch companies that remains actively engaged in dealings with commercial divers. More specifically, Roman Frischknecht is a commercial diver that has been an Oris ambassador for some time, and rather than simply being an ambassador in name, Roman has played a crucial role in the development of the ProDiver collection ahead of its launch in 2009.It was his insight that led to the creation of the brand’s bezel locking system, known as a Rotation Safety System. Given the level of safety and security protocols involved in his line of work, Roman knew that if he was to be using a conventional dive watch in a modern dive environment, there could be absolutely no room for error, thus a locking mechanism (as seen in other divers like the Omega Ploprof, among others) would be mandatory.Although the roots of the Yacht-Master II relate to activities on the water’s surface rather than deep below, its unique functionality is perfectly suited to this category. After all, the Rolex Yacht-Master II is what is often referred to as yachting timer – a countdown chronograph that can be used to properly measure the start time of a regatta, also known as a sailing race.Arguably the most complex watch in the present Rolex collection, the Yacht-Master II uses an interesting combination of bezel position, crown position, and pusher action in order to set its countdown duration between 1 and 10 minutes, with the chronograph capable of flyback (or fly-forward) functionality to the pre-set time with a single activation of its lower pusher. While many Yacht-Master II wearers are unlikely to ever use this highly specific function for its actual intended purpose. being able to run a countdown like this isn’t shy on practical daily-life applications… grilling timer, anyone?

The ref. 16710 is outfitted with a standard 40mm Oyster case with water-resistance up to 100 meters and a protective sapphire crystal over the dial. The bezel is equipped with an aluminum insert in either all-black, red and blue, or red and black. Depending on the year of production, the watch is also available on the secondary market with cases that have either lug holes or no lug holes, and the luminous material on the dial will vary, as Rolex made the switch from Tritium to LumiNova during the production of the reference 16710 GMT-Master II.With the release of the ref. 116710 came a brand new case design that includes the upgrade to a triple-sealed Triplock screw-down crown, a new bezel mounting system that operates on 24 clicks instead of 120, a tougher “Cerachrom” bezel insert crafted from a scratchproof ceramic material, and a “Maxi” dial topped with larger hour markers and wider hands. The 40mm case also received a larger crown guard and wider lugs, earning it the nickname the “Super Case” among collections due to its thicker and more aggressive overall appearance.The ref. 16710 is equipped with the self-winding Rolex Caliber 3185 perpetual movement, which includes a Quickset function for easy adjustment of the date mechanism, hacking, an independent 24-hour hand, and a 48-hour power reserve. However, near the very end of production of the ref. 16710, Rolex switched movements, and later-era examples of the reference 16710 were equipped with the Caliber 3186 movement. The Caliber 3186 has the same specifications as the Caliber 3185 but is now equipped with Rolex’s newer paramagnetic blue Parachrom hairspring and a smoother operating jump-hour hand. With that in mind, all reference 116710 GMT-Master II watches run solely on the Caliber 3186.