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By May 26, 2022October 14th, 2022Glossary - Rolex

Oyster Case

The world’s first waterproof wristwatch case, pioneered by Rolex in 1926. It is a revolutionary system in which the case back and winding crown are hermetically screwed on to the case. The Oyster case is featured on every Oyster Perpetual model, guaranteeing waterproofness to a depth of 100 metres (330 feet).


Innovative bracelet developed and patented by Rolex. It combines the robustness and reliability of a metal bracelet with the flexibility, comfort and aesthetics of an elastomer strap. At its core lie two flexible metal blades – one for each section of the bracelet – overmoulded with high-performance black elastomer.


Oysterlock is a safety clasp system developed and patented by Rolex, designed to prevent accidental opening and ensure secure fastening of the bracelet. Housed inside a curved cover that seamlessly integrates with the bracelet, the Oysterlock comprises a click-down safety catch, a patented snap-fit lever, and a spring-loaded lever to prevent accidental opening.


Stainless steel alloy developed for Rolex, which offers an exceptional sheen. Oystersteel belongs to the 904L steel family – alloys whose excellent anti-corrosion properties are comparable to those of precious metals. In 1985, Rolex became the first watchmaking brand to use 904L stainless steel for cases of all its steel watches.