Measuring 40mm across, the case is crafted from 18kt yellow gold with a monobloc middle case, screw-down case back, and a screw-down Twinlock winding crown offering waterproofness to 100 metres. The bezel is set with diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens over the date keeps the champagne-colour index dial clearly legible at a glance.
The President bracelet — built from 18kt yellow gold with semi-circular three-piece links — fastens via a concealed folding Crownclasp. Inside, the perpetual mechanical self-winding Calibre 3255 delivers a power reserve of approximately 70 hours, a precision of -2/+2 seconds per day after casing, and features a paramagnetic blue Parachrom hairspring alongside high-performance Paraflex shock absorbers. The movement carries Superlative Chronometer certification, reflecting both COSC and Rolex's own post-casing standards.
Functions include centre hour, minute, and seconds hands, along with instantaneous day and date displays in apertures with secure rapid-setting and stop-seconds for precise time adjustment. Reference 228398TBR-0007 is a 2024 production example of the Day-Date 40.
