Rolex Sea Dweler 126603LN Steel and Yellow Gold *Full Set 2020* [ID15816]

Rolex Sea-Dweller – Ref. 126603 – Stainless Steel and 18 ct Yellow Gold – 2020 – Full Set – Official Rolex Service 06/2026

The Rolex Sea-Dweller Ref. 126603 represents one of the most exclusive and sophisticated interpretations of Rolex’s iconic collection of professional diving watches. Introduced in 2019, this model marked the first time in the history of the Sea-Dweller that Oystersteel and 18 ct yellow gold were combined in a single watch. Known by Rolex as Yellow Rolesor, this configuration brings a distinguished aesthetic without compromising the extraordinary technical performance that defines the collection.

Its impressive 43 mm Oyster case is crafted from Oystersteel and 18 ct yellow gold, combining polished and satin-finished surfaces. Engineered to withstand extreme pressure conditions, it offers exceptional water resistance to 1,220 metres (4,000 feet). It incorporates a helium escape valve, developed to allow the controlled release of gases accumulated during decompression phases in professional saturation diving.

One of the most distinctive features of this reference is its unidirectional rotatable 60-minute bezel, fitted with a black ceramic Cerachrom insert, virtually scratchproof and highly resistant to corrosion. Its graduations are coated with a thin layer of yellow gold, providing an elegant contrast and excellent legibility. The fluted edge of the bezel, crafted from 18 ct yellow gold, allows easy handling even when wearing diving gloves.

The black dial features large hour markers and hands with Chromalight display, providing a long-lasting blue luminescence in low-light conditions. Particularly distinctive is the yellow “Sea-Dweller” inscription, a detail that harmonizes perfectly with the gold elements of the watch. The date is positioned at 3 o’clock, beneath the characteristic Cyclops lens integrated into the scratch-resistant sapphire crystal.

At its heart is the Rolex calibre 3235, a self-winding mechanical manufacture movement entirely developed and produced by Rolex. It incorporates the Chronergy escapement, a paramagnetic blue Parachrom hairspring and high-performance Paraflex shock absorbers. Certified as a Superlative Chronometer, it guarantees a precision of -2/+2 seconds per day after casing and offers a power reserve of approximately 70 hours.

The watch is equipped with a robust three-piece Oyster bracelet in Oystersteel and 18 ct yellow gold, featuring solid gold centre links. It incorporates an Oysterlock safety clasp and the Rolex Glidelock extension system, allowing precise adjustment of the bracelet length without tools, providing exceptional comfort for both everyday wear and diving activities.

This example dates from 2020 and is offered as a complete Full Set, accompanied by its original Rolex box, warranty card, documentation and corresponding accessories.

Furthermore, the watch underwent an official Rolex service in June 2026, an important added value that provides greater peace of mind and confidence to its next owner. This recent intervention carried out by the brand’s official service centre further enhances the appeal of this example, particularly for those who value proper maintenance and the service history of a luxury timepiece.

The Sea-Dweller 126603 combines the capabilities of a genuine professional diving instrument with the elegance of Yellow Rolesor, offering an impressive wrist presence and a distinctive personality within the Rolex collection.

Technical Specifications

• Reference: 126603

• Model: Sea-Dweller

• Year: 2020

• Set: Full Set

• Last Service: Official Rolex Service, June 2026

• Case Material: Oystersteel and 18 ct yellow gold (Yellow Rolesor)

• Diameter: 43 mm

• Bezel: Unidirectional rotatable 60-minute bezel, black Cerachrom with yellow gold-coated graduations

• Crystal: Scratch-resistant sapphire with Cyclops lens

• Dial: Black with yellow Sea-Dweller inscription

• Luminescence: Long-lasting Chromalight

• Movement: Rolex calibre 3235 automatic

• Precision: -2/+2 seconds per day after casing

• Power Reserve: Approximately 70 hours

• Functions: Hours, minutes, seconds and date

• Bracelet: Three-piece Oyster in Oystersteel and 18 ct yellow gold

• Clasp: Oysterlock with Rolex Glidelock extension system

• Crown: Screw-down Triplock

• Helium Escape Valve: Yes, automatic

• Water Resistance: 1,220 metres / 4,000 feet

• Certification: Superlative Chronometer

• Documentation: Rolex warranty card dated 2020

• Includes: Original Rolex box, documentation and corresponding accessories

Rolex Sea-Dweller 126603: Power, Exclusivity and Watchmaking Tradition

The Rolex Sea-Dweller 126603 stands out for its extraordinary combination of Oystersteel, 18 ct yellow gold and black ceramic, offering a sporty yet sophisticated aesthetic that distinguishes it from traditional stainless steel configurations.

Its 43 mm case, exceptional 1,220-metre water resistance and advanced calibre 3235 make this reference one of Rolex’s most complete offerings for those seeking a professional diving watch with an elegant and distinguished presence.

This 2020 example, complete with its original Full Set and officially serviced by Rolex in June 2026, represents an attractive opportunity to enjoy one of the most distinctive models in the Sea-Dweller collection, with the added benefit of recent maintenance carried out by the brand’s official service centre.

Available now. Contact us for further information and conditions.