Reference 228349RBR-0001 presents the Day-Date 40 in a 40 mm 18 kt white gold Oyster case built around a monobloc middle case, screw-down case back, and screw-down winding crown secured by the Twinlock double waterproofness system. The diamond-set bezel adds a further layer of brilliance to a watch rated waterproof to 100 metres, while scratch-resistant sapphire crystal with a Cyclops lens over the date ensures legibility in any light.
The silver dial is itself set with diamonds, its hour markers replaced by 10 baguette-cut diamonds that frame the instantaneous day and date displays in their respective apertures. Powering the watch is Rolex Calibre 3255, a perpetual, mechanical, self-winding movement featuring a paramagnetic blue Parachrom hairspring, high-performance Paraflex shock absorbers, bidirectional winding via a Perpetual rotor, and a power reserve of approximately 70 hours. The movement holds Superlative Chronometer certification — combining COSC qualification with Rolex's own post-casing standard — delivering a precision of -2/+2 seconds per day.
The 18 kt white gold President bracelet, composed of semi-circular three-piece links, completes the watch with a concealed folding Crownclasp that keeps the design clean from the wrist outward. Stop-seconds functionality allows exact time setting, rounding out a specification that places this Day-Date 40 firmly at the summit of the collection.
