This Rolex Sea-Dweller, reference 126603, is a 43mm case in Steel and Yellow Gold used condition, featuring a Black Standard dial, a Black Ceramic Standard bezel, a Oyster bracelet.
Rolex · 126603
Rolex Sea-Dweller in Steel and Yellow Gold, 43mm case, Black Standard dial, Black Ceramic Standard bezel.
The Sea-Dweller occupies Rolex's professional dive hierarchy between the Submariner and the Deepsea. Developed in partnership with saturation-diving company COMEX in the late 1960s, its signature feature is a helium escape valve at nine o'clock, enabling pressure equalization during decompression. Steel references omit the cyclops magnifier over the date—a deliberate, tool-first detail collectors respect. The addition of the Rolesor variant has since broadened the line's appeal beyond pure utility. Read the full Sea-Dweller buying guide ›
Founded in 1905 by Hans Wilsdorf, Rolex is the benchmark by which most mechanical watches are measured. The Geneva manufacture pioneered waterproofing, self-winding movements, and date displays, earning a reputation for precision and durability that transcends horology. Today it dominates the prestige sports-watch market and functions as much as a financial asset class as a timepiece. Browse all Rolex ›