Housed in a 36 mm platinum Oyster case, reference 128236-0020 features a monobloc middle case, solid screw-down case back, and a screw-down winding crown secured by the Twinlock double waterproofness system. The scratch-resistant sapphire crystal incorporates a Cyclops lens over the date aperture, and the watch is waterproof to 100 metres / 330 feet. The fluted bezel completes the platinum case with the material's characteristic weight and tone.
The blue ombré dial is set with Roman numeral hour markers and displays the instantaneous day and date in dedicated apertures with secure rapid-setting — the signature complication that gives the Day-Date its name. The platinum President bracelet, featuring semi-circular three-piece links, fastens via a concealed folding Crownclasp for a seamless look on the wrist.
Power comes from the Rolex Calibre 3255, a perpetual mechanical self-winding movement with bidirectional winding via a Perpetual rotor and a power reserve of approximately 70 hours. The oscillator uses a paramagnetic blue Parachrom hairspring and high-performance Paraflex shock absorbers, delivering a precision of -2/+2 seconds per day after casing. The movement is COSC certified and includes stop-seconds for exact time setting.
