SUPERLATIVE CHRONOMETER CERTIFICATION
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A Rolex Lasts a Lifetime

To ensure that your watch performs as well throughout your life as on the day you bought it. All that is needed is to give your Rolex just the smallest bit of care. Located in the heart of Jakarta, the new Rolex Service Centre continues to uphold Rolex’s uncompromised standard of quality as well as a lifetime of appreciation of your watch.

The green seal accompanying every Rolex watch is a symbol of its status as a Superlative Chronometer. Rolex’s new Superlative Chronometer Certification redefines performance by going beyond the strictest precision criteria in the industry. This exclusive designation attests that it has successfully undergone a series of specific final controls by Rolex in its own laboratories according to its own criteria which exceeds watchmaking norms and standards, in addition to the official COSC certification of its movement. This unique testing of the chronometric precision of the cased-up movement, as well as of the watch’s waterproofness, self-winding and power reserve, pushes back the boundaries of performance and makes Rolex the benchmark for excellence in mechanical watches. The green seal is coupled with a five-year international guarantee which applies to all Rolex watches. 

"Superlative chronometer officially certified"

Historically, a watch could be designated as a chronometer by its own manufacturer to attest of its high precision. To guarantee the quality of its chronometers, Rolex made the choice to have them officially certified, in their quest for continuous innovation to ensure the highest degree of precision for its watches over time and to perpetuate the excellence of the Oyster. To mark this difference, in the late 1930s, the brand changed the inscription on its dials from “Chronometer” to “Officially Certified Chronometer”. In 1951, official certification became obligatory. But, wanting to continue to differentiate its chronometers from others, the brand set its sights on another goal: obtaining certificates avec mention (certificates of superior performance). By the late 1950's, Rolex launched a new generation of movements, the 1500 calibres, equipped with a balance wheel with gold Microstella screws, offering excellent chronometric performance.


Archive document, first “Class A” Chronometer certificate in the world, 1914.

Though the chronometer certificates avec mention were made obsolete in 1973 following the creation of the Swiss Official Chronometer Testing Institute, this remains as a reminder of the brand’s pioneering spirit in the field of chronometric precision.

Rolex established a new standard of excellence when they created the term “Superlative Chronometer” which would thereafter be inscribed on the dials to constitute the well-known phrase “Superlative Chronometer Officially Certified” in the late 1950s.

The criteria that made Rolex watches “Superlative Chronometers” in the late 1950s were reinforced in 2015 to establish a new standard of excellence for mechanical watches.

Pushing the Benchmark

In its history, the term Superlative Chronometer is synonymous with the Oyster series and has been imprinted on the serial portion of the series since the late 1950s. This designation has been reinforced with the introduction of a new Rolex certification that is more rigorous than existing watchmaking norms and standards and is applied to 100 per cent of the brand’s watches.

To ensure the status of Superlative Chronometer, Rolex applies a series of rigorous tests in his lab. The four aspects tested are the level of precision, power reserve capability, waterproofness, and self-winding. This 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. After 15 days and 15 nights of testing involving seven eliminating criteria in five static positions and at three temperatures, each movement is submitted to COSC for its official certification.


Rolex Oyster Perpetual Cosmograph Daytona

In the pursuit of precision, Rolex tests the accuracy of each watch after casing the movement over a 24-hour cycle, in seven static positions as well as in a rotating rack. The deviation for a Rolex Superlative Chronometer must not exceed −2/+2 seconds per day, after casing, versus −4/+6 seconds per day required by COSC for the movement alone.

The waterproofness of each watch is tested next by subjecting it to excess internal air pressure and then by immersion in water in a hyperbaric tank. Watches guaranteed waterproof to a depth of 100 metres are tested at a water pressure equivalent to their rated depth plus 10 per cent, while divers’ watches – waterproof to 300, 1,220 and 3,900 metres – are tested with an additional safety margin of 25 per cent.

The self-winding capacity is also an important consideration where the winding power of the Perpetual rotor self-winding module is checked with special tools to ensure each component interacts optimally and has no obstacles or friction in the casing process. All watches are fully wound at the beginning of the tests, and the power reserve of each watch is checked according to the specifications for the various movements by determining how long it runs before stopping.


Rolex Oyster Perpetual Day-Date 40 and the Rolex Green Seal

After passing the entire trial indicating the quality of a product (including resistance to the magnetic field and impact), 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.

In Pursuit of Superlative Precision

Rolex’s goal has always been to produce watches of the highest quality, notably in terms of precision and reliability. The designation “Superlative Chronometer Officially Certified” inscribed on the dial of each Oyster is a true signature of Rolex watches. Formulated in the late 1950s, this inscription symbolizes the brand's tireless pursuit of chronometric excellence, given the pioneering role it played in developing wristwatch precision from early in the 20th century.

In 1957, Rolex launched a new generation of movements, the 1500 calibres, equipped with a balance wheel with gold Microstella screws, offering excellent chronometric performance. (Today, Microstella nuts have replaced the screws). The rate results achieved showed greater precision than the criteria for obtaining a mention. To mark these exceptional qualities, Rolex created the term of "Superlative Chronometer". After 1973, the creation of the Swiss Official Chronometer Testing Institute (COSC) consolidated the various official watch rating centres and led to the adoption of unified criteria which rendered mentions obsolete. Rolex continued to legitimize the “Superlative” qualification of its chronometers with more extensive in-house testing of every single watch. In 2015, the criteria that made Rolex watches “Superlative Chronometers” in the late 1950s were then reinforced to establish a new standard of excellence for mechanical watches.


Rolex Superlative Chronometer

The Rolex service procedure is designed to ensure that every timepiece leaving a Rolex workshop complies with its original functional and aesthetic specifications. Each movement is completely overhauled and each case and bracelet is meticulously refinished to restore its lustre. Timekeeping accuracy and water-resistance are rigorously tested to guarantee the level of quality and reliability you naturally expect from a Rolex watch.

In order to meet all your service needs, Rolex maintains an extensive network of Service Centres carefully selected for their uncompromising professionalism and expertise. The new Rolex Service Centre in Jakarta will open its doors on 15 August 2018 at the Ground Floor of Centennial Tower, Jalan Gatot Subroto kav.24-25, Jakarta Selatan. For more information, call +62 21 2935 3555 or email to [email protected]


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