Sailing Spirit The Oyster Perpetual Yacht-Master 40 is a nautical-inspired timepiece that reflects Rolexs deep connection to the world of sailing. Designed for versatility and legibility, it balances technical performance with refined aesthetics. Marine Functionality This reference, from 2007, features a 40mm case and a rotatable bezel marked for 60 minutes. Powered by the calibre 3135 automatic movement with an approximate 70-hour power reserve, it is fitted with an Oyster bracelet and Oysterlock clasp for secure wear on and off the water.