Rolex
Rolex Sea-Dweller 126603
The Rolex Sea-Dweller (reference 126603) is a 43 mm Yellow Rolesor watch with a black dial. It runs on the automatic caliber 3235 with a 70-hour power reserve and is water resistant to 1220 m. It was introduced in 2019 and is still in production.
Specifications
Case
- Reference
- 126603
- Collection
- Sea-Dweller
- Case size
- 43 mm
- Case material
- Yellow Rolesor
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 1220 m
- Bracelet / strap
- Yellow Rolesor
Dial and bezel
- Dial
- Black
- Bezel
- Black Cerachrom, gold-coated numerals
Movement
- Movement
- Automatic
- Caliber
- 3235
- Power reserve
- 70 hours
- Frequency
- 28,800 vph
- Functions
- Date
Production
- Production
- 2019 – today (current)
Dial versions
This reference was made with these dials and finishes.
126603 Black
126603-0001
Black
How it compares within the Sea-Dweller family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 126603 (This watch) | 43 mm | Yellow Rolesor | Black | 3235 | 2019– |
| 116600 | 40 mm | Oystersteel | Black | 3135 | 2014–2017 |
| 116660 | 44 mm | Oystersteel and titanium | — | 3135 | 2008–2018 |
| 126067 | 50 mm | RLX titanium | Black | 3230 | 2022–2025 |
| 126600 | 43 mm | Oystersteel | Black | 3235 | 2017– |
| 126660 | 44 mm | Oystersteel and titanium | — | 3235 | 2018–2022 |
| 136660 | 44 mm | Oystersteel and RLX titanium | — | 3235 | 2022– |
| 136668LB | 44 mm | 18k yellow gold | Blue | 3235 | 2024– |
| 16660 | 40 mm | Stainless Steel | Black | 3035 | 1978–1989 |
About the Sea-Dweller family
The Sea-Dweller was introduced in 1967 with ref. 1665 for professional saturation divers, adding a helium escape valve and a deeper water rating to the Submariner design. The ref. 16600 continued the line from the late 1980s, and the Rolex Deepsea joined in 2008 with its Ringlock case system and much greater depth rating.
In 2017 the Sea-Dweller grew to 43 mm with ref. 126600, which brought back a line of red text on the dial and added a Cyclops lens. A Rolesor version, ref. 126603, followed. The catalog also covers Deepsea references such as the 126660 and 136660, the yellow gold 136668LB and the RLX titanium Deepsea Challenge ref. 126067. Dealers note the dial version and, on Deepsea models, the dial colour.
Quick answers
- What size is the Rolex Sea-Dweller 126603?
- The Rolex Sea-Dweller 126603 has a 43 mm case.
- What movement does the Rolex Sea-Dweller 126603 use?
- It uses the automatic caliber 3235, with a 70-hour power reserve.
- How water resistant is the Rolex Sea-Dweller 126603?
- It is water resistant to 1220 metres.
- Is the Rolex Sea-Dweller 126603 still in production?
- Yes, it is a current reference.
- When did the Rolex Sea-Dweller 126603 come out?
- It was introduced in 2019.
- What is the Rolex Sea-Dweller 126603 made of?
- The case is Yellow Rolesor. Bracelet or strap: Yellow Rolesor.
Catalog facts checked October 2026.