Cover Final visual and functional check of an Oyster Perpetual Datejust 41
Final visual and functional check of an Oyster Perpetual Datejust 41
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Since debuting in 1926, the Rolex Oyster has set the standard for modern wristwatches. We trace the timepiece’s enduring legacy and how it became a timeless icon of watchmaking
The Rolex Oyster represents a ground-breaking milestone in horology, embodying founder Hans Wilsdorf’s vision and tenacity. Launched in 1926, the world’s first hermetically sealed, waterproof wristwatch signalled a new era in watchmaking. This innovation was the culmination of Wilsdorf’s relentless pursuit of precision, reliability and elegance for more than two decades.
His goal was to transform the wristwatch from a delicate accessory into a precise, indispensable tool. The visionary’s first breakthrough came in 1910, when a Rolex wristwatch received the first-ever chronometer certificate from an official Swiss watch rating centre. This certification was a testament to the precision of a Rolex timepiece, a quality previously associated only with pocket watches. Four years later, Rolex astonished the watchmaking world when the Kew Observatory in England—the highest authority for chronometric precision at the time—awarded a Class ‘A’ precision certificate to a Rolex wristwatch that was typically reserved for large marine chronometers. This marked a significant leap in the credibility of wristwatches.
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Above Final visual and functional check of an Oyster Perpetual Datejust 41
Final visual and functional check of an Oyster Perpetual Datejust 41
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With precision mastered, Wilsdorf turned to creating a watch that could withstand activities of everyday life. This led to the invention of the Oyster in 1926, the world’s first waterproof wristwatch.
This featured a breakthrough patented system encompassing a screw-down bezel, caseback and winding crown that created a hermetically sealed environment, protecting the movement from dust, water and other impurities. It is named Oyster because, as Wilsdorf explained, “like an oyster, it can remain an unlimited time underwater without detriment to its parts”. This innovation meant wearers no longer had to remove their watches for daily activities, like washing hands or bathing, significantly enhancing the watch’s practicality and durability.
The Oyster provided optimal protection for the movement, ensuring long-term precision. The hermetic seal was not just a feature, but a revolutionary concept that combined case and movement into a unified whole to improve chronometric performance. Maintaining waterproofness was crucial for accuracy, as it protected intricate mechanical parts from moisture and impurities.
Above One of Rolex’s first Oyster watches—in a version with an eight-sided case, from 1926
One of Rolex’s first Oyster watches—in a version with an eight-sided case, from 1926
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But like all watches of the time, the Oyster required regular manual winding, which involved the unscrewing of its waterproof crown that could compromise the integrity of the hermetic seal. To perfect the Oyster, Wilsdorf developed a self-winding mechanism. After years of research, the Perpetual rotor was introduced in 1931: an ingenious innovation that allowed the watch to wind itself via the motion of the wearer’s wrist. This mechanism preserved the watch’s waterproofness by eliminating the need to unscrew the crown frequently, and enhanced precision by maintaining a consistent energy supply to the movement.
The Perpetual rotor was the third fundamental pillar required to complete the Oyster concept and take on a very broad meaning that linked time and movement. Today, the concepts of waterproofness and self-winding are ubiquitous in modern mechanical watches, a testament to Rolex’s pioneering work. The constant charging of the mainspring through wrist movements ensured greater regularity and precision, cementing the Rolex Oyster Perpetual as the archetype of the modern watch.
Above Testing of the winding system via a Perpetual rotor
Testing of the winding system via a Perpetual rotor
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Rolex’s dedication to innovation didn’t stop at the Perpetual rotor. Over the decades, it has relentlessly pushed the boundaries of what is possible in watchmaking. The manufacture has registered over 600 patents, each contributing to the performance, durability, and aesthetics of its watches. Key innovations include the Twinlock winding crown. Introduced in 1953, it ensured the winding crown remained waterproof even if it wasn’t perfectly screwed down. The system provided extra security for divers and professionals, who relied on their watches in extreme conditions.
In 2000, Rolex introduced the Parachrom hairspring, a component made from an exclusive alloy of niobium, zirconium, and oxygen offering exceptional resistance to magnetic fields and temperature variations. Enhancing the watch’s precision, it remains up to ten times more accurate than traditional hairsprings in case of shocks. Further reinforcing Rolex’s commitment to durability, the brand developed the Paraflex shock absorber, which increases the movement’s resistance to shocks by 50 per cent to ensure the watch maintains optimum performance even in demanding conditions.
Above In-house casting of 18-karat gold alloys used in the manufacture of Rolex watches
In-house casting of 18-karat gold alloys used in the manufacture of Rolex watches
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Rolex’s pursuit of excellence extends to the aesthetics and functionality of its watches. Introduced on professional models in the Oyster collection, the Cerachrom bezel is made from a hard, corrosion-resistant ceramic that is virtually impervious to scratches, with colours that remain unaffected by UV rays. This component ensures that the watch retains its beauty and legibility.
In 2015, Rolex engineers devised and patented the Chronergy escapement. Optimising the efficiency of the traditional Swiss lever escapement, this innovation improves energy transmission to the oscillator by 15 per cent, contributing to the increased autonomy of the latest Rolex movements. Made of nickel-phosphorus, the Chronergy escapement is resistant to magnetic interference, guaranteeing the watch’s precision in various environments.
Above Assembly of a Rolex movement by hand
Assembly of a Rolex movement by hand
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Catering to different tastes and needs, the Oyster Perpetual collection now comprises 12 ranges that are split into two categories: classic and professional. From the elegant Datejust and Day-Date to the robust Submariner and Explorer, the Oyster Perpetual line embodies Rolex’s commitment to excellence. Unveiled in 1945, the Datejust was the first wristwatch to feature an automatically changing date on the dial, while the Day-Date, launched in 1956, was the first to display both the date and the day of the week spelt out in full.
In the professional category, Rolex developed watches for specific activities, such as the GMT-Master for aviators, the Cosmograph Daytona for racing enthusiasts, and the Yacht-Master for sailors and navigators. Each model combines Rolex’s signature precision, reliability and elegance with features tailored to its wearers’ needs.
Credits
Images: Rolex
