Since its first launch in 1956, the iconic Day-Date marked a world first: it was the first calendar wristwatch to indicate the day of the week spelt out in full in a window on the dial in addition to the date—a technical feat at the time.
Encircling the wrists of presidents, leaders and visionaries worldwide, the Day-Date is re-introduced—the Oyster Perpetual Day-Date 40—with a new 40 mm case, new-generation movement, and an enhanced President bracelet. Immediately recognisable on a wrist, the solid 18 ct gold or 950 platinum bracelet with three semi-circular links provides complete reliability and comfort.
New ceramic inserts in the links add suppleness and durability, while a cleverly concealed attachment beneath the fluted bezel provide seamless visual continuity between bracelet and case. Meanwhile, a hinged Rolex crown reveals a hidden Crownclasp that adds an aesthetically functional touch to this elegant bracelet.
Available in 26 languages from European languages to Arabic, Chinese, Bahasa Indonesia and even Latin, the Day-Date's calendar displays the day of the week spelt out in full in an arc-shaped window at 12 o'clock. The famous Cyclops lens, invented by Rolex, magnifies the date display at 3 o'clock. This Day-Date system enables quick undisturbed at-a-glance view, and ease of adjustment is facilitated through the winding crown.
The word "Perpetual" in the name originates from the Perpetual rotor, a Rolex-patented self-winding system developed in 1931. A system later adopted by the whole watchmaking industry, the winding mechanism makes use of a half-moon-shaped oscillating weight that continually winds the mainspring using natural wrist movements. This self-winding module is incorporated in the Calibre 3255, which has a power reserve of 70 hours - this means that the watch will easily continue to run across three days without needing to be rewound.
Further to that, the Calibre 3255 is a consummate demonstration of Rolex technology, with 14 patents, offering fundamental gains in terms of precision, power reserve, resistance to shocks and magnetism, ease of use and reliability. Housed within a 100-metre water-resistant Oyster case, this self-winding mechanical movement incorporates the new Chronergy escapement patented by Rolex, which combines high energy with great dependability.
The oscillator, the true heart of the watch, has an optimized blue Parachrom hairspring. Patented and manufactured by Rolex in an exclusive para-magnetic alloy, it is also up to 10 times more precise than a traditional hairspring in case of shocks.
Rolex has established a level of chronometric precision that surpasses the level defined by COSC (the Swiss Official Chronometer Testing Institute) criteria, with precision twice as exacting as those for an officially certified chronometer