At 31 mm, this Datejust 31 is built around a Yellow Rolesor construction — Rolex's combination of Oystersteel and yellow gold — carrying through from the monobloc middle case and fluted bezel to the Jubilee bracelet with its five-piece links and concealed folding Crownclasp. A screw-down case back and screw-down Twinlock winding crown contribute to waterproofness rated to 100 metres, while scratch-resistant sapphire crystal with a Cyclops lens over the date keeps the dial clearly legible.
The white dial is dressed with Roman numeral hour markers, offering a classic, easy-to-read face. Powering the watch is Rolex's Calibre 2236, a perpetual, mechanical self-winding movement certified as a Superlative Chronometer — meeting both COSC standards and Rolex's own post-casing certification for a precision rating of -2/+2 seconds per day. The oscillator features a Syloxi silicon hairspring with patented geometry and Paraflex shock absorbers, with bidirectional winding via a Perpetual rotor delivering 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 adjustment. Reference 278273-0002 represents a versatile size suited to a wide range of wearers, wrapped in the enduring elegance of the Datejust lineage.
