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Rolex Sea-Dweller watches

The Rolex Sea-Dweller family covers 2 models and 2 references, with case sizes from 43 mm.

2 models · 2 references

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Size
Case material
Dial colour
Movement (calibre)
Water resistance

2 models

  • Rolex Sea-Dweller 126600, reference 126600-0002, black dial, stainless steel case
    RolexSea-Dweller 126600stainless steel case1 reference43 mm
  • Rolex Sea-Dweller 126603, reference 126603-0001, black dial, stainless steel and yellow gold case
    RolexSea-Dweller 126603stainless steel and yellow gold case1 reference43 mm

About the Rolex Sea-Dweller

The Sea-Dweller dates from 1967 and was built for saturation divers, who spend long periods at depth breathing a helium and oxygen mix. Its defining feature is the helium escape valve, which lets helium that has entered the case escape during decompression so the crystal is not forced off. The first production reference, 1665, had a 40mm case rated to 610 metres, and later references raised this to 1,220 metres. In 2017 Rolex enlarged the case to 43mm with reference 126600, which added calibre 3235 and, for the first time on a Sea-Dweller, a Cyclops lens over the date. A steel and yellow gold version, reference 126603, followed in 2019.

Sources: Monochrome: History of the Rolex Sea-Dweller (May 2025), Fratello: Five generations of Rolex Sea-Dweller, Wikipedia: Rolex Sea-Dweller

Movements

Key movements

  • Rolex calibre 3235 2 references

Questions

Rolex Sea-Dweller questions

How many Rolex Sea-Dweller watches are on Watchnik?

Watchnik lists 2 Rolex Sea-Dweller models and 2 references.

What case sizes do Rolex Sea-Dweller watches come in?

Recorded case diameters run from 43 mm across the 2 references.

Which movement is used most in Rolex Sea-Dweller watches?

The Rolex calibre 3235 appears in the most references, 2 of them.

Sources

Sources and last updated

Specifications are compiled from watch database records and manufacturer information; missing values are shown as not yet recorded, never estimated. Data last updated 1 October 2026. How we source our data

Watchnik

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