Reference 128345RBR-0077 presents the Day-Date in a 36mm monobloc middle case crafted from 18 kt Everose gold, featuring a screw-down case back and winding crown with Twinlock double waterproofness. The bezel is set with diamonds, while scratch-resistant sapphire crystal with a Cyclops lens over the date completes the case. Water resistance extends to 100 metres / 330 feet.
The white mother-of-pearl dial is itself set with diamonds, with hour positions marked by 10 baguette-cut diamonds. Instantaneous day and date displays appear in apertures, and a stop-seconds function allows for precise time setting. The 18 kt Everose gold President bracelet with its characteristic semi-circular three-piece links fastens via a concealed folding Crownclasp.
Powering the watch is Rolex Calibre 3255, a perpetual mechanical self-winding movement with a precision rating of -2/+2 seconds per day after casing. The oscillator employs a paramagnetic blue Parachrom hairspring alongside high-performance Paraflex shock absorbers, and bidirectional winding via the Perpetual rotor delivers approximately 70 hours of power reserve. The movement holds Superlative Chronometer certification, reflecting both COSC and Rolex's own post-casing standards.
