Reference 128398TBR-0006 presents the Day-Date 36 in an 18 kt yellow gold Oyster case measuring 36 mm across. The monobloc middle case is secured by a screw-down case back and a screw-down Twinlock winding crown, delivering waterproofness to 100 metres. A scratch-resistant sapphire crystal with a Cyclops lens over the date completes the case architecture, while the diamond-set bezel adds a layer of brilliance to the overall composition.
The dark grey dial is set with diamonds in 18 kt gold settings throughout, with baguette-cut diamonds positioned at 6 and 9 o'clock for added depth and contrast. Displaying the full day and date in instantaneous apertures, the dial layout reflects the Day-Date's long-standing role as Rolex's flagship complication. The 18 kt yellow gold President bracelet — featuring its hallmark semi-circular three-piece links — secures via a concealed folding Crownclasp.
Power comes from the Calibre 3255, a perpetual mechanical self-winding movement manufactured by Rolex. It offers a precision rating of -2/+2 seconds per day after casing, an approximately 70-hour power reserve, and features a paramagnetic blue Parachrom hairspring alongside Paraflex shock absorbers. The movement holds Superlative Chronometer certification, reflecting both COSC timing standards and Rolex's own post-casing verification.
