Rolex Yacht-Master

The Rolex Yacht-Master is a sport watch made by Rolex, first introduced in 1992 with the model 16628 in 18-carat yellow gold. In 1994, Rolex released a lady's model (69628) and a mid-size man's model (68628), which was the first time Rolex had ever issued a smaller professional size watch. In 1996, Rolex introduced two-tone (stainless steel and 18-carat yellow gold) to the lady's and mid-size line.
In 1997, Rolex released the Yacht-Master in Rolesium, a term patented by Rolex in 1932 which gives the Yacht-Master a stainless steel and platinum construction; the bezel and dial are platinum, while the case, band, crown, etc. are stainless steel. This model is also known as the Platinum Yacht-Master. 
In 1999, Rolex discontinued the two-tone model 68623, replacing it with the two-tone model 168623 in 2000. The difference between the two models are in the upgraded movement in the 168623, and the heavier 18-carat gold links (the links in the 68623 are hollow). 
In 2007, the brand released the Rolex Yacht-Master II regatta chronograph watch, the world's first watch equipped with a programmable countdown from 1 to 10 minutes with a mechanical memory. 
In 2015, Rolex launched the Everose Yacht-Master, the very first Rolex watch to come with a rubber strap, called the Oysterflex. The Everose Yacht-Master comes in two sizes - 37mm (268655) and 40mm (126655).
In 2019, Rolex introduced the Rolex Yacht-Master 42, the first time-and-date Yacht-Master watch with a case size of 42 mm. The case, bezel, and Oysterlock clasp are made of white gold, while the bezel has a matte black Cerachrom insert.
As of year 2020, the Rolex Yacht-Master is offered in 37 mm, 40 mm and 42 mm case sizes. All Rolex Yacht-master models have a water resistance rating of .