Reference 228348RBR-0005 presents the Day-Date 40 in its most distinguished form: an 18kt yellow gold case measuring 40mm, featuring a monobloc middle case, screw-down case back, and a screw-down 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 front profile. Water resistance reaches 100 metres / 330 feet.
The silver dial carries a diagonal motif index design, displaying the day and date through instantaneous apertures with secure rapid-setting. The 18kt yellow gold President bracelet — constructed with semi-circular three-piece links — fastens via a concealed folding Crownclasp, keeping the watch's refined lines uninterrupted at the wrist.
Inside runs the perpetual, mechanical, self-winding Calibre 3255, a Manufacture Rolex movement offering approximately 70 hours of power reserve and a precision rating of -2/+2 seconds per day after casing. The oscillator features a paramagnetic blue Parachrom hairspring and high-performance Paraflex shock absorbers, with the movement holding Superlative Chronometer certification — reflecting both COSC approval and Rolex's own post-casing standards.
