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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11“Oyster Perpetual” combines two ideas: an Oyster case designed to protect the watch, and a Perpetual self-winding mechanism powered by wrist motion. “Perpetual” does not mean the watch runs forever without being worn, wound or serviced. Rolex also uses Oyster Perpetual as the name of a current watch collection.
What does “Oyster” mean on a Rolex?
“Oyster” refers to Rolex’s water-resistant case concept. Rolex says the name began with its Oyster wristwatch, introduced in 1926. Its case construction used a system that screwed the bezel, case back and winding crown against the middle case.
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Rolex describes the idea as broader than watertightness: the case is intended to resist natural elements that could interfere with the watch’s operation. The name is therefore a reference to protection, not a claim that every watch bearing it can be used in every water activity.
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“Perpetual” refers to automatic winding. A rotor inside the watch turns as the wearer moves their wrist; that motion drives a mechanism that winds the mainspring, which stores energy to run the watch.
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The word does not mean perpetual motion. If a watch is left unworn long enough for its stored power to run down, it will stop and need to be wound or worn again. Like other mechanical watches, it also needs maintenance.
Why are the words combined?
Together, “Oyster Perpetual” describes a watch that pairs the Oyster protective-case concept with the Perpetual self-winding mechanism. Rolex also applies the name to a current collection, so it can refer either to the two watchmaking ideas or to a specific family of Rolex watches.
How the Oyster and Perpetual milestones fit together
The name brings together developments from different years, rather than a single invention introduced all at once. Rolex’s account gives this chronology:
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| Year | Milestone |
|---|---|
| 1910 | Rolex says a watch received a chronometric-precision certificate from the Official Watch Rating Centre in Bienne, Switzerland. |
| 1926 | Rolex presented the Oyster, described by the company as its first waterproof and dustproof wristwatch. |
| 1931 | Rolex registered patents for a self-winding mechanism with a free rotor, called “Perpetual.” Wrist movement turned the rotor to wind the mainspring. |
These are separate milestones: the 1910 certificate predates the Oyster case, and the Perpetual rotor followed the Oyster’s introduction.
What does the name refer to in the current collection?
Rolex lists Oyster Perpetual models in five case diameters. The company assigns the following calibres by size:
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- Pre-Loved Condition: Excellent; Faint scratching to back of case
- 26mm
- Made in Switzerland
- Oysterclasp Closure
- Signature upon delivery required
| Case diameter | Rolex-stated calibre |
|---|---|
| 28 mm | 2232 |
| 31 mm | 2232 |
| 34 mm | 2232 |
| 36 mm | 3230 |
| 41 mm | 3230 |
These specifications identify the sizes and movement assignments Rolex publishes for the collection; they do not determine which size will suit a particular wearer.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do Rolex’s water-resistance and precision figures mean?
Water resistance
Rolex states that the current Oyster Perpetual case is guaranteed waterproof to 100 metres (330 feet). This is Rolex’s published specification, not an independent test result, and the figure alone does not establish that a particular watch is appropriate for every water activity.
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Rolex states that its finished-watch Superlative Chronometer precision requirement is −2 to +2 seconds per day. The company distinguishes this from the movement’s earlier official chronometer certification, for which it lists a tolerated rate deviation of −4 to +6 seconds per day for the calibres concerned. The two figures apply at different stages: one to the certified movement and the other to the finished watch under Rolex’s testing.
Rolex says that in 2026 its Superlative Chronometer certification expanded to seven criteria: precision, waterproofness, self-winding, autonomy, resistance to magnetism, reliability and sustainability. These are Rolex’s published certification criteria and specifications, not independently verified performance findings.
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