Housed in a 40 mm platinum Oyster case, the Day-Date 40 (ref. 228236-0010) features a monobloc middle case with screw-down case back and a screw-down Twinlock winding crown, offering water resistance to 100 metres. A scratch-resistant sapphire crystal with Cyclops lens over the date sits atop a white dial dressed with Roman numeral hour markers.
The platinum President bracelet with semi-circular three-piece links closes via a concealed folding Crownclasp, maintaining the clean lines the Day-Date is known for. The fluted bezel completes the case in matching platinum.
Inside runs the Calibre 3255, a perpetual mechanical self-winding movement from Manufacture Rolex, COSC certified to a precision of -2/+2 seconds per day after casing. It winds bidirectionally via a Perpetual rotor, stores approximately 70 hours of power reserve, and incorporates a paramagnetic blue Parachrom hairspring alongside Paraflex shock absorbers. Day and date displays advance instantaneously with secure rapid-setting, and a stop-seconds function enables precise time setting.
