The Sea-Dweller was developed for saturation divers working the offshore oil fields, engineered with a helium escape valve to survive decompression that would crack an ordinary dive watch. This reference keeps that professional pedigree in a case built for serious wear, bought today as much for the story as the depth rating.

The 43 mm Oystersteel case is rated to 1,220 metres, with a black Cerachrom bezel insert and the calibre 3235, a Superlative Chronometer with a 70 hour power reserve.