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A Rolex Oyster case resists water because its bezel, case back and winding crown screw down against the middle case to form a sealed enclosure. That construction is not a blanket guarantee for every Rolex or every activity: check your exact model’s depth rating, make sure the crown is fully screwed down, and consider the watch’s condition and service history before exposing it to water.
How the Oyster case keeps water out
Rolex says it conceived and patented the Oyster case in 1926. The bezel, case back and winding crown screw down against the middle case, helping form a hermetic enclosure that keeps water and dust away from the movement. The crown is a critical seal: after winding or setting the watch, it must be screwed down fully.
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The crown system varies by model. Rolex’s historical account describes Twinlock, introduced in 1953, as using a double seal; Triplock, introduced in 1970, adds a sealed zone and appears on some models, including diving watches. The design details do not make every Oyster model equally water-resistant.
Rolex says it checks waterproofness in a hyperbaric tank. Its published account states that watches rated to 50 or 100 metres are tested at pressure at least equivalent to, or up to 10% higher than, the pressure at their rated depth. For diver’s watches rated to 300 metres or more, Rolex states a 25% safety margin under the standards in effect for that type of watch. These are descriptions of Rolex’s production tests, not instructions to use a watch at that depth.
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Check the exact model’s depth rating
Rolex’s current care FAQ gives different ratings for different families: Oyster Perpetual wristwatches are waterproof to at least 100 metres, while Perpetual 1908 models are rated to 50 metres. The FAQ also cites 1,220 or 3,900 metres for certain Oyster watches. These figures are model-specific; the word “Oyster” by itself does not establish a rating.
Use the rating published for your exact watch, and take its condition into account. A depth marking is not a guarantee for a watch that is damaged, has been opened, or has not been tested after its seals may have aged. Rolex’s pages do not establish that an older or untested watch retains its original waterproofness.
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Before a swim, shower or dive
Rolex addresses pool, shower, ocean and diving questions by directing owners to the model’s rating and correct crown position. There is no blanket yes based only on the Oyster name. Before water exposure, confirm the winding crown is fully screwed down against the case; Rolex says to tighten it until it cannot turn any further. Also consider the watch’s service and waterproofness-testing history.
For diving, do not infer that a depth rating alone makes every real-world dive suitable. Match the activity to the exact model’s published rating and the watch’s condition. If you cannot confirm either, avoid water exposure until a professional has checked it.
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Clean the watch without compromising its seals
- Secure the crown first. Before cleaning or exposing the watch to water, screw the winding crown down fully against the case.
- Wipe it for routine care. Rolex suggests occasionally wiping the watch with a microfiber cloth.
- Wash the case and bracelet when needed. Rolex’s care instructions call for soapy water and a soft brush. Its FAQ excludes leather straps from this washing advice, so follow the care instructions for the exact strap or bracelet.
- Rinse off salt and sand. After wearing the watch at sea or on the beach, rinse it with fresh water to remove residue.
Do not open the case, replace seals or attempt a pressure test yourself. Rolex treats seal replacement and waterproofness testing as professional service operations.
When to arrange professional service
Rolex recommends periodic professional servicing to help maintain accuracy and waterproofness, approximately every 10 years depending on the model and real-life use. That interval is a manufacturer recommendation, not a guarantee that a watch remains water-resistant until its next service.
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Rolex’s servicing procedure includes replacing seals and testing waterproofness. If the watch has been opened, damaged, or has an uncertain service history, have it inspected and tested by an Official Rolex Jeweler or Service Center before relying on it in water.
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Rolex’s official guidance
- Caring for your Rolex: crown handling, routine cleaning and care.
- Caring for your Rolex — Frequently Asked Questions: model-family ratings, water-use questions and service guidance.
- Behind the crown — Mastering waterproofness: Oyster case history and crown systems.
- Waterproofness: Rolex’s stated pressure-testing process.
- Servicing your Rolex — Our servicing procedure: seal replacement and waterproofness testing during service.
- Watchmaking — Case: case architecture and the 1926 patent history.
Rolex’s linked guidance is official manufacturer information; the pages do not display publication dates. Accessed 12 October 2026.
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