In 2014 Rolex returned to a 40mm Sea Dweller with the Rolex Sea-Dweller 116600, or SD4000. Although the 116600 had the same diameter case as the Submariner at 40mm, the case was slightly thicker in order to accommodate the helium escape valve to ensure a depth rating of 1220m. The Sea Dweller 4000 also featured a black ceramic bezel with divers scale, matte black dial with applied hour markers, Mercedes style hands and was powered by the calibre 3135 automatic movement. The 116600 was fitted with an oyster bracelet with glide-lock clasp. The Rolex Sea Dweller 116600 4000 was discontinued in 2017 making it one of the shortest production runs for any Rolex sports model.
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