Reference 128238-0046 presents the Day-Date 36 in a round 36 mm case crafted from 18K yellow gold. The Oyster architecture features a monobloc middle case, solid case back, and a screw-down winding crown secured by Rolex's Twinlock double waterproofness system, offering water resistance to 100 metres / 330 feet. A scratch-resistant sapphire crystal with a Cyclops lens over the date sits above the champagne-colour dial, while the fluted bezel completes the classic profile.
The watch rides on a diamond-set President bracelet in 18K yellow gold, fastened by a concealed folding Crownclasp. Powering the timepiece is the perpetual, mechanical, self-winding Calibre 3255, a Manufacture Rolex movement delivering a power reserve of approximately 70 hours and a precision rating of -2/+2 seconds per day after casing — certified as a Superlative Chronometer through both COSC and Rolex's own post-casing standards. The oscillator incorporates a paramagnetic blue Parachrom hairspring alongside high-performance Paraflex shock absorbers.
Functions include centre hour, minute, and seconds hands alongside instantaneous day and date displays in dedicated apertures, with secure rapid-setting and stop-seconds for exact time setting.
