The Rolex Yacht-Master II is a sport watch made by Rolex, unveiled in 2007 and first introduced in March 2010 with the models 116688 and 116689. One year later, in 2011, Rolex introduced the model 116681 which was made from steel and everose gold. At Baselworld 2013, the watch was available for the first time in 904L steel, the model 116680, fitted with a Cerachrom bezel insert in blue ceramic. Originally, the Yacht-Master II used Rolex's 4160 movement but with the introduction of the model 116680 in 2013, the movement was updated to the 4161 movement specifically designed for the Yacht-Master II. All Yacht-Master II watches have a case size of 44mm.