Reference 128239-0063 presents the Day-Date 36 in an 18 kt white gold Oyster case measuring 36 mm across. The fluted bezel frames a scratch-resistant sapphire crystal fitted with a Cyclops lens over the date window, while a monobloc middle case, solid case back, and screw-down Twinlock crown combine to deliver waterproofing to 100 metres.
The blue ombré dial is dressed with Roman numeral hour markers, offering a gradated depth of colour that shifts across the surface. It is carried on an 18 kt white gold President bracelet composed of semi-circular three-piece links and fastened by a concealed folding Crownclasp.
Powering the watch is the Rolex Calibre 3255, a COSC-certified perpetual mechanical self-winding movement with a precision rating of -2/+2 seconds per day after casing. It features bidirectional winding via a Perpetual rotor, a paramagnetic blue Parachrom hairspring, Paraflex shock absorbers, instantaneous day and date displays with secure rapid-setting, stop-seconds functionality, and an approximately 70-hour power reserve.
