Rolex Deep Sea Dweller 44mm 136660DBLUEOverview The 136660DBLUE was designed around a single engineering objective: survive 3,900 metres of pressure. The case architecture required to meet that the Ringlock System, a 5. 5mm domed sapphire crystal, a grade 5 titanium caseback, a 44mm width makes no concession to wearing comfort. This is the technical extreme of Rolex's dive watch programme. The case is 44mm Oystersteel with a titanium caseback and the Ringlock System a nitrogen pressurised
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