The Rolex Datejust model is the front-runner of the Rolex Oyster Collection. An officially certified Swiss Chronometer, self-winding. Time-numbers is fitted with Dimond,featuring date display, the Oyster Datejust is available in a broad range of model. All are fitted with a crystal crafted from a solid block of synthetic sapphire that is virtually scratch proof.They are waterproof to 100 m/330 feet.