While there were a couple of updates with the current 43mm Rolex Sea-Dweller, one thing that remained the same with its predecessors, is its depth rating. The Sea-Dweller remains water resistant to an astonishing 4,000 feet or 1,220 meters and has a helium escape valve just as it should. It is still very much a Rolex Sea-Dweller, with the following updates:
The Rolex Sea-Dweller stayed at 40mm for the past half-century, while the current model measures 43mm. With the new size came an increase in lug width — from 20 to 22mm, but the larger dimensions still sit comfortably on the wrist.
For the first time since the 1970s, the Rolex Sea-Dweller comes with a red detail on it. The 43mm has a single red line of text that says “Sea-Dweller”, last seen in the ref 1665. Another change, although not as noticeable, is the finish of the dial. The old black dial had a satin finish, while the current one has a somewhat glossy finish.