At 31 mm, this Datejust 31 wears a round Oyster case built from Everose Rolesor, blending Oystersteel with Everose gold. The monobloc middle case is sealed by a solid screw-down case back and a screw-down Twinlock winding crown, delivering water resistance to 100 metres / 330 feet. A scratch-resistant sapphire crystal with a Cyclops lens over the date sits above the slate dial, while the domed bezel is set with diamonds for a touch of quiet brilliance.
The Jubilee bracelet — crafted in the same Everose Rolesor combination and featuring five-piece links — secures via a concealed folding Crownclasp. Inside the solid case back, Rolex Calibre 2236 provides the power: a perpetual, mechanical, self-winding movement with bidirectional winding via a Perpetual rotor, a Syloxi silicon hairspring with patented geometry, and Paraflex shock absorbers. The movement offers approximately 55 hours of power reserve and achieves a precision of -2/+2 seconds per day after casing as a Superlative Chronometer, meeting both COSC and Rolex's own post-casing certification standards.
Functions include centre hour, minute, and seconds hands, an instantaneous date with rapid setting, and stop-seconds for precise time adjustment. Reference 278341RBR-0018 is listed here as described; please refer to the listing details for information regarding box and papers.
