The Rolex Submariner Date (16618CEL) has an 18k Yellow Gold Case with an awesome 31 jewel chronometer movement as well a sapphire crystal. This watch was designed to fit any wrist since its demand is so high, so they put a fliplock clasp and extension link for this purpose. It has a beautiful blue time-lapse bezel for keeping track of your daily activities, weather it be diving (water resistant to 1000 feet)or making sure you get on time to your company meeting, you can rely on this watch. This great watch will also track the date, as this is referred to in the watchs name.