Sea-Dweller

A legend among divers’ watches, the Oyster Perpetual Sea-Dweller was created to accompany the pioneers of deep-sea diving.

A technical divers’ watch, the Sea-Dweller was designed for the pioneers of professional deep-sea diving. The first Sea-Dweller models were guaranteed waterproof to a depth of 610 metres (2,000 feet); the watch was then guaranteed to a depth of 1,220 metres (4,000 feet) in 1978.

Updated in 2017 for its 50th anniversary, the Sea-Dweller now features a larger 43 mm case and calibre 3235, a new-generation movement at the forefront of watchmaking technology. It is, of course, equipped with the helium escape valve, patented by Rolex in 1967. This safety valve allows excess pressure built up in the watch case to escape during a diver’s decompression phase in a hyperbaric chamber.

BEZEL WITH CERACHROM INSERT

The unidirectional rotatable bezel of the Sea-Dweller is fitted with a 60-minute graduated Cerachrom insert in black ceramic that allows divers to monitor their time underwater. The insert, patented by Rolex, is made of an extremely hard and corrosion-resistant ceramic; it is virtually scratchproof and its colour is unaffected by ultraviolet rays. The moulded, recessed numerals and graduations are coated with yellow gold or platinum using a PVD (Physical Vapour Deposition) process. The bezel’s knurled edge offers excellent grip, to comfortably set dive time even when wearing gloves.

LEGIBLE AND FUNCTIONAL

On the dial, the Chromalight hour markers and hands are filled with a luminescent material emitting a long-lasting blue glow – lasting up to two times longer than traditional phosphorescent materials. On the bezel, the zero marker of the graduation, in the form of a triangle, is visible in the dark thanks to an embedded capsule containing the same luminescent material.

THE SEA-DWELLER, A SUPERLATIVE CHRONOMETER

Like all Rolex watches, the Sea-Dweller 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 magnetic fields and shocks.

THE OYSTER CASE, SYMBOL OF WATERPROOFNESS

The Sea-Dweller’s Oyster case, guaranteed waterproof to a depth of 1,220 metres (4,000 feet), is a paragon of robustness and reliability. The characteristically shaped middle case is crafted from a solid block of particularly corrosion-resistant Oystersteel. The case back, edged with fine fluting, is hermetically screwed down with a special tool that allows only certified Rolex watchmakers to access the movement. The winding crown, fitted with the Triplock triple waterproofness system, screws down securely against the case, providing watertight security. The crown guard is an integral part of the middle case. The crystal is made of virtually scratchproof sapphire, and features a Cyclops lens at 3 o’clock to enhance the reading of the date. The waterproof case provides the Sea-Dweller’s high-precision movement with optimal protection.

PERPETUAL CALIBRE 3235

The Sea-Dweller is equipped with calibre 3235, 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 3235 has 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 3235 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 Sea-Dweller’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 3235 is a new-generation movement entirely developed and manufactured by Rolex for a superlative level of performance. 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 3235 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 3235 extends to approximately 70 hours.

BRACELET AND CLASP: SECURE AND COMFORTABLE

The Sea-Dweller is fitted on a three-piece link Oyster bracelet, equipped with a Rolex-designed and -patented Oysterlock safety clasp, which prevents accidental opening. It also features the Rolex Glidelock extension system, designed and patented by the brand. This inventive toothed mechanism, integrated beneath the clasp, allows fine adjustment of the bracelet length by some 20 mm in increments of approximately 2 mm, without the use of tools. The watch can therefore be worn over a diving suit up to 3 mm thick.

The Oyster bracelet on the Oystersteel version is also equipped with the Fliplock extension link, whose fold-out links enable the bracelet to be extended by approximately 26 mm without the use of tools. Together, the two extension systems allow the watch to be worn over a diving suit up to
7 mm thick.

A concealed attachment system ensures seamless visual continuity between the bracelet and case.

Models

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