Reference 228349RBR-0030 presents the Day-Date 40 in an 18 kt white gold Oyster case measuring 40 mm across. The bezel is set with diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens over the date protects the dial below. A screw-down winding crown with Twinlock double waterproofness keeps the watch sealed to 100 metres / 330 feet.
The olive green dial features Roman numeral hour markers and displays the day and date in dedicated apertures via an instantaneous, secure rapid-setting mechanism. The President bracelet, crafted in 18 kt white gold with semi-circular three-piece links, fastens with a concealed folding Crownclasp for a seamless look on the wrist.
Inside runs the Rolex Calibre 3255, a perpetual mechanical self-winding movement with bidirectional winding via a Perpetual rotor and an approximately 70-hour power reserve. The oscillator features a paramagnetic blue Parachrom hairspring and high-performance Paraflex shock absorbers, achieving a precision of -2/+2 seconds per day after casing. The movement carries Superlative Chronometer certification, combining COSC testing with Rolex's own post-casing verification.
