Notes: The steel and gold Rolex Yacht-Master reference 16623 is a striking variation of Rolex's highly sought-after Regatta sports watch. Equipped with a gold 60-minute bezel, the Yacht-Master can be used to sync with race start times as well as measure other increments of time while at sea. The case is waterproof up to 330 feet and offers a highly legible reading via a dial topped with contrasting black hour markers and luminous Mercedes hands. A three-piece link Oyster bracelet with stainless steel and high-polish yellow gold links and a folding Oysterlock clasp offer a secure hold for all-day wear as well as while sailing. Thanks to the two-tone finish, the Yacht-Master 16623 isn't just versatile, it's an affordable option for those who are in the market for a gold Rolex sports watch.

Despite the numerous variations that have been released, the classic, men’s size Yacht-Master has always had a case diameter of 40 mm, and has always been powered by Rolex’s Caliber 3135 movement (which, to be honest, by 2018, is a bit long-in-the-tooth). Additionally, the entire bezel on a Yacht-Master is always craft from precious metal – either solid 18-karat yellow gold or 950 platinum.

Mechanism: The 3135 is a continuation of the 3035 series. Rolex launched it in 1977 and was profoundly different from its predecessors. As the company’s first high-beat movement, it increased the balance speed from 19,800 BPH to 28,800 BPH. This higher frequency has since become the standard across all of Rolex’s range. It also allowed the caliber to provide more accurate timekeeping and better withstand outside influences, such as shock. Like most Rolex mechanisms ending with a "5", this unit has a date function. All modern Rolex date-equipped mechanisms have a 'Quickset' feature as well.

The popular caliber 3135 measures 28.50 mm in diameter and 6.00 mm in height. The Submariner uses this caliber. This makes it quite large when compared with other Rolex movements. The larger size of the movement means that it is more robust and has the ability to incorporate more parts and components. This allows the watch that utilizes it to perform more reliably and durably. It also offers a frequency of 28.800 vph.