Reference 128399TBR-0023 presents the Day-Date 36 in an 18 kt white gold Oyster case measuring 36 mm in diameter. The monobloc middle case is closed by a screw-down case back and a screw-down Twinlock winding crown, delivering water resistance to 100 metres. A scratch-resistant sapphire crystal with a Cyclops lens over the date completes the case architecture.
The white mother-of-pearl dial is set with diamonds and marked by 10 baguette-cut diamond hour indices, while the bezel is fully set with diamonds for additional brilliance. Powering the watch is the Calibre 3255, a perpetual mechanical self-winding movement manufactured by Rolex. It operates within a precision of -2/+2 seconds per day after casing, carries Superlative Chronometer certification, features a paramagnetic blue Parachrom hairspring with Paraflex shock absorbers, and delivers approximately 70 hours of power reserve via a bidirectional Perpetual rotor.
The watch is worn on an 18 kt white gold President bracelet composed of semi-circular three-piece links, secured by a concealed folding Crownclasp. Instantaneous day and date displays appear in dedicated apertures, with a stop-seconds function for precise time setting.
