# 2020 Rolex Sea-Dweller 126603 Black Dial Stainless Steel

- Link: https://palazzowatches.com/product/2020-rolex-sea-dweller-126603-black-dial/
- Published: 2025-10-16T14:44:02-04:00
- Author: Michael Martucci

## Details

- Stock number: 456NQ
- Availability: Out of stock
- Case Material: Stainless Steel
- Brand: Rolex
- Year: 2020
- Reference: 126603
- Dial Color: Black
- Condition: Pre-owned
- Movement: Automatic
- Case Size: 43mm
- Offered by: Palazzo Watches & Gems, Jersey City, NJ

The Rolex Sea-Dweller reference 126603 is the watch that ended nearly fifty years
of all-steel tradition when Rolex introduced the first and only two-tone Sea-Dweller
at Baselworld 2019. Combining Oystersteel with 18k yellow gold on the bezel, winding
crown, and bracelet center links — what Rolex terms Yellow Rolesor — the 126603 
brings precious-metal elegance to a model line engineered originally for professional
saturation divers operating at the outer limits of human depth. The 43mm Oyster 
case is rated to 1,220 meters of water resistance and equipped with the helium escape
valve that permits safe decompression after extended saturation, paired with the
unidirectional 60-minute Cerachrom ceramic bezel finished with yellow gold numerals.
The black lacquered dial carries large Chromalight applied indices and Mercedes 
hands, with the date at three magnified by the Cyclops lens — a cosmetic feature
that arrived on the Sea-Dweller for the first time with this reference. Powered 
by the in-house Rolex Caliber 3235, a Superlative Chronometer with paramagnetic 
blue Parachrom hairspring, Chronergy escapement, Paraflex shock absorbers, and approximately
70 hours of power reserve. Worn on the matching Oyster bracelet with Glidelock and
Fliplock extension systems. 2020 production, pre-owned in excellent condition.