Day-date

Available only in precious metals, the Oyster Perpetual Day-Date is the most prestigious and most exclusive watch in the Oyster Perpetual collection.
At its launch in 1956, the Day-Date was a major innovation: it was the first calendar wristwatch to indicate, in addition to the date, the day of the week spelt out in full in a window on the dial – a technical feat at the time. The Day-Date has only ever been made from precious metals – 18 ct yellow, white or Everose gold, or 950 platinum.

THE “PRESIDENTS’ WATCH”

Worn by many of the world’s political figures, directors and visionaries, the Day-Date is instantly recognizable, in particular thanks to its emblematic President bracelet, whose evocative name, together with the eminent figures who have worn it, ensured the Day-Date became known as the “presidents’ watch”.


INSTANTANEOUS DAY AND DATE

The Day-Date’s calendar displays the day of the week spelt out in full in an arc-shaped window at 12 o’clock in addition to the date in a separate window at 3 o’clock. This display relies on disc mechanisms; the day and date change simultaneously and instantaneously. The indication of the day of the week is available in a choice of 26 languages. The Day-Date is also equipped with a mechanism allowing rapid adjustment of the day and the date using the winding crown.

THE DAY-DATE, SUPERLATIVE CHRONOMETER

Like all Rolex watches, the Day-Date is certified as a Superlative Chronometer. This exclusive designation testifies that every watch leaving the brand’s workshops has successfully undergone a series of tests conducted by Rolex in its own laboratories and according to its own criteria, which exceed watchmaking norms and standards. These tests are carried out on the fully assembled watch, in order to guarantee superlative performance on the wrist. The Superlative Chronometer status is symbolized by the green seal that comes with every Rolex watch and is coupled with an international five-year guarantee.

The precision of every movement – officially certified as a chronometer by COSC (Swiss Official Chronometer Testing Institute) – is tested a second time by Rolex after being cased, to ensure that it meets criteria for precision that are far more exacting than those for an official chronometer. The tolerance for the average rate of a Rolex Superlative Chronometer is of the order of −2/+2 seconds per day. Its precision is tested by Rolex using an exclusive methodology that simulates the conditions in which a watch is actually worn and is much more representative of real-life experience.

The Superlative Chronometer certification testing is carried out after casing using state-of-the-art equipment specially developed by Rolex. The entirely automated series of tests also checks the waterproofness, the self-winding capacity and the power reserve of 100 per cent of Rolex watches. These tests systematically complement the qualification testing during development and production that ensures the watches’ reliability, robustness, and resistance to magnetism and shocks.


THE OYSTER CASE, SYMBOL OF WATERPROOFNESS AND ELEGANCE

The Day-Date’s Oyster case, guaranteed waterproof to a depth of 100 metres (330 feet), is a paragon of robustness and elegance. The characteristically shaped middle case is crafted from a solid block of either 18 ct gold or 950 platinum. The case back, edged with fine fluting, is hermetically screwed down with a special tool that grants only certified Rolex watchmakers access to the movement. The winding crown, fitted with the Twinlock double waterproofness system, screws down securely against the case. The bezel can be fluted, smooth or set with diamonds. The date display is magnified by a Cyclops lens on the crystal, which is made of virtually scratchproof sapphire The waterproof Oyster case provides the Day-Date’s high-precision movement with optimal protection.


PERPETUAL CALIBRE 3255

Day-Date models are equipped with calibre 3255 (Day-Date 36 and Day-Date 40), a self-winding mechanical movement entirely developed and manufactured by Rolex. The architecture, manufacturing and innovative features of this movement make it exceptionally precise and reliable.

The oscillator has a large balance wheel with variable inertia regulated extremely precisely via gold Microstella nuts. It is held firmly in place by a height-adjustable traversing bridge enabling very stable positioning to increase shock resistance.

Calibre 3255 features an optimized version of the blue Parachrom hairspring, manufactured by Rolex in an exclusive paramagnetic alloy. Insensitive to magnetic fields, the Parachrom hairspring offers great stability in the face of temperature variations and remains up to 10 times more precise than a traditional hairspring in case of shocks. It is equipped with a Rolex overcoil, ensuring its regularity in any position.

Calibre 3255 is fitted with a self-winding module featuring a Perpetual rotor, which ensures continuous winding of the mainspring by harnessing the movements of the wrist to provide a constant source of energy.

The Day-Date’s movement will be seen only by certified Rolex watchmakers, yet it is beautifully finished and decorated in keeping with the brand’s uncompromising quality standards.


NEW GENERATION MOVEMENT

Calibre 3255 is a new-generation movement entirely developed and manufactured by Rolex for a superlative level of performance. This self-winding mechanical movement is at the forefront of the art of watchmaking. A consummate demonstration of Rolex technology, it offers fundamental gains in terms of precision, power reserve, resistance to shocks and magnetic fields, convenience and reliability.

The oscillator is fitted on high-performance Paraflex shock absorbers, designed and patented by Rolex, which increase the movement’s shock resistance.

Calibre 3255 incorporates the Chronergy escapement, patented by Rolex, which combines high energy efficiency with great dependability. Made of nickel-phosphorus, this escapement is also insensitive to magnetic fields. Thanks to the barrel architecture and the escapement’s superior efficiency, the power reserve of calibre 3255 extends to approximately 70 hours.


THE PRESIDENT BRACELET

Created specially for the Day-Date at its launch in 1956, the elegant and imposing President bracelet is inherent to the standing of the watch. Immediately recognizable, this solid gold or platinum bracelet with three semi-circular links provides complete reliability and comfort.

The President bracelet is fitted with a concealed Crownclasp, opened with a hinged Rolex crown – the final aesthetic and functional touch to this bracelet. It includes ceramic inserts inside the links to enhance its flexibility and longevity. A concealed attachment system on the bracelet ensures seamless visual continuity between the bracelet and case.

Models

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