Reference 128398TBR-0037 presents the Day-Date 36 in its most jewellery-forward expression. The 36 mm monobloc case is crafted in 18 kt yellow gold and fitted with a scratch-resistant sapphire crystal housing a Cyclops lens over the date aperture. The bezel is set with diamonds, and the screw-down Twinlock winding crown ensures waterproofness to 100 metres / 330 feet.
The champagne-coloured dial is itself set with diamonds, with 10 baguette-cut diamond hour markers lending the face a richly architectural quality. Day and date are displayed simultaneously through instantaneous apertures, complemented by a stop-seconds function for precise time setting. The 18 kt yellow gold President bracelet closes with a concealed folding Crownclasp.
Powering the watch is the Calibre 3255, a perpetual mechanical self-winding movement bearing Superlative Chronometer certification — a combined COSC and Rolex post-casing standard — with a precision rating of -2/+2 seconds per day and a power reserve of approximately 70 hours. The oscillator features a paramagnetic blue Parachrom hairspring and high-performance Paraflex shock absorbers, winding bidirectionally via the Perpetual rotor.
