Cased in White Rolesor — Rolex's combination of Oystersteel and white gold — this 31 mm Datejust presents a round case with a monobloc middle, solid case back, and a screw-down winding crown featuring the Twinlock double waterproofness system. Water resistance extends to 100 metres / 330 feet, and the scratch-resistant sapphire crystal carries a Cyclops lens positioned over the date window.
The bright black dial is set with Roman numeral hour markers and is read through the magnifying Cyclops lens. Powering the watch is the Calibre 2236, a perpetual mechanical self-winding movement manufactured by Rolex, offering a precision of -2/+2 seconds per day after casing. The oscillator features a Syloxi silicon hairspring with patented geometry and high-performance Paraflex shock absorbers, while bidirectional winding via the Perpetual rotor delivers approximately 55 hours of power reserve. Functions include centre hour, minute, and seconds hands, an instantaneous date with rapid setting, and stop-seconds for precise time setting. The movement is COSC certified.
The five-piece-link Jubilee bracelet in Oystersteel secures with a concealed folding Crownclasp, lending the watch its characteristically refined wrist presence. Reference 278274-0002 is the Datejust 31 in a configuration that balances the fluted white gold bezel against the deep contrast of the bright black dial.
