Reference 228348RBR-0034 presents the Day-Date 40 in an 18kt yellow gold Oyster case measuring 40mm, featuring a monobloc middle case, screw-down case back, and a screw-down Twinlock winding crown for waterproofness to 100 metres / 330 feet. The bezel is set with diamonds, while scratch-resistant sapphire crystal with a Cyclops lens over the date completes the case.
The white dial is appointed with Roman numeral hour markers and displays the day and date through instantaneous apertures with secure rapid-setting. The 18kt yellow gold President bracelet — composed of semi-circular three-piece links — secures via a concealed folding Crownclasp for a refined, seamless look on the wrist.
Powering the watch is Rolex Calibre 3255, a perpetual mechanical self-winding movement with bidirectional winding via a Perpetual rotor, approximately 70 hours of power reserve, and a paramagnetic blue Parachrom hairspring with high-performance Paraflex shock absorbers. The movement carries Superlative Chronometer certification — encompassing COSC qualification followed by Rolex certification after casing — delivering a precision of -2/+2 seconds per day.
