At 28mm, the Lady-Datejust ref. 279163-0019 wears the classic Oyster architecture: a monobloc middle case, screw-down case back, and a screw-down Twinlock winding crown that together deliver water resistance to 100 metres / 330 feet. The domed bezel frames a scratch-resistant sapphire crystal fitted with a Cyclops lens positioned over the date window, while the silver dial keeps the presentation clean and legible.
Power comes from the Caliber 2236, a perpetual mechanical self-winding movement made by Rolex. It runs on a bidirectional Perpetual rotor, stores approximately 55 hours of power reserve, and achieves a precision of -2/+2 seconds per day after casing — earning Superlative Chronometer status through both COSC certification and Rolex's own post-casing verification. The oscillator relies on a Syloxi silicon hairspring with patented geometry and Paraflex shock absorbers, alongside an instantaneous date display with rapid-setting and stop-seconds functions.
The watch is presented on a Jubilee bracelet in Yellow Rolesor — the same Oystersteel-and-yellow-gold combination as the case — secured by a concealed folding Crownclasp. The result is a cohesive two-tone look that has defined the Lady-Datejust across generations.
