This alphanumeric serial Rolex Yacht-Master II Ref:116680 44MM is rated 9.8 out of 10. This watch is a chronograph created specifically for yacht racing. It has a unique countdown feature with mechanical memory which is programmable from 10 minutes to one and this is done by the Ring Command bezel, a patented rotatable bezel that interacts with the watch’s movement. It comes with box, service card in November 2018 and warranty card dated in June 2014.