At 36 mm, the Day-Date reference 128399TBR-0027 is built around an 18 kt white gold Oyster case featuring a monobloc middle case, screw-down case back, and a screw-down Twinlock winding crown that delivers waterproofness to 100 metres. Scratch-resistant sapphire crystal with a Cyclops lens over the date completes the case architecture.
The bright blue dial is set with 10 baguette-cut diamonds serving as hour markers, while the bezel is itself set with diamonds — a combination that gives the watch a thoroughly gem-forward character. The President bracelet in 18 kt white gold features semi-circular three-piece links and fastens via a concealed folding Crownclasp.
Inside beats Rolex Calibre 3255, a perpetual mechanical self-winding movement certified as a Superlative Chronometer — meeting both COSC standards and Rolex's own post-casing certification — with a precision rating of -2/+2 seconds per day. A paramagnetic blue Parachrom hairspring, Paraflex shock absorbers, bidirectional winding via a Perpetual rotor, and approximately 70 hours of power reserve round out the movement's specification.
