Created in 1967 to accompany the pioneers of deep-sea diving and updated for its 50th anniversary in 2017, the Oyster Perpetual Sea-Dweller offers everything – and more – divers could ever dream of.


– 43 mm Oyster case, waterproof to a depth of 1,220 metres (4,000 feet)

– Helium escape valve

– Rotatable bezel with a 60-minute graduated virtually scratchproof Cerachrom insert

– Chromalight display (long-lasting luminescence) – Rolex-certified Superlative Chronometer – Manufacture Rolex self-winding mechanical movement, COSC certified

– Paramagnetic blue Parachrom hairspring

– Oysterlock safety clasp with Rolex Glidelock system for fine adjustment of the bracelet length and Fliplock extension link

A technical divers’ watch, the Sea-Dweller was designed in 1967 for the pioneers of professional deep-sea diving. Originally waterproof to a depth 610 metres (2,000 feet), the watch was then guaranteed to a depth of 1,220 metres (4,000 feet) in 1978.

Updated for its 50th anniversary in 2017 – with the name “Sea-Dweller” in red on the dial in reference to the first model – the Sea-Dweller features a 43 mm case and calibre 3235, a new-generation movement at the forefront of watchmaking technology. It is, of course, equipped with one of the inventions that contributed to its stature: 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.


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 underwater and decompression time for their safety. The insert, patented by Rolex, is made of an extremely hard and corrosion-resistant ceramic, is virtually scratchproof and its colour is unaffected by ultraviolet rays. The numerals and the graduations are moulded in the ceramic and coloured with platinum using a PVD (Physical Vapour Deposition) process. The bezel’s knurled edge offers excellent grip when manipulating the bezel to set dive time, even when wearing gloves. 


Great attention was paid to the legibility of this professional divers’ watch. 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 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.


Like all Rolex watches, each Sea-Dweller is certified as a Superlative Chronometer. This exclusive designation attests that it 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 its 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, therefore, 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 upstream during development and production that ensures the watches’ reliability, robustness, and resistance to magnetic fields and shocks.


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 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.


The Sea-Dweller is equipped with calibre 3235, a self-winding mechanical movement entirely developed and manufactured by Rolex. Its architecture, manufacturing and innovative features 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 blue Parachrom hairspring patented and 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 equipped with a self-winding module via 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.


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 the Rolex-designed and –patented high-performance Paraflex shock absorbers, increasing shock resistance by 50 per cent.

Calibre 3235 incorporates the Chronergy escapement patented by Rolex, which combines high energy efficiency with great dependability. Made of nickel-phosphorus, it is also insensitive to magnetic interference. Thanks to the barrel architecture and the escapement’s superior efficiency, the power reserve of calibre 3235 now extends to approximately 70 hours. 


The Sea-Dweller’s Oyster bracelet is equipped with a Rolex-designed and -patented Oysterlock safety clasp that prevents accidental opening, and with a double extension system that allows the watch to be worn comfortably over a diving suit up to 7 mm thick, without using any tools. The Rolex Glidelock fine-adjustment system, developed and patented by Rolex, allows the bracelet length to be increased by some 20 mm in increments of approximately 2 mm. The Fliplock extension link is a fold-out link that allows the bracelet on the Sea-Dweller to be extended by 26 mm.