Introduced in 1956, the Oyster Perpetual Day-Date was the first calendar watch to display the fully spelled day of the week and the date. This model, which exemplifies Rolex's commitment to excellence, has rapidly gained popularity among influential individuals. Its Oyster case, guaranteed to be watertight to a depth of 100 meters or 330 feet, exemplifies both durability and elegance. The 18K yellow gold fluted bezel surrounds a neat white dial with applied yellow gold Roman numerals. The sapphire crystal's Cyclops lens at 3 o'clock makes it easy to read the date. In addition, the Oyster Perpetual Day-Date is equipped with a Rolex self-winding movement.