Rolex Datejust 31 mm

The Rolex Datejust 31 mm, reference 278240-0005, is a women's model with a 31 mm Oystersteel case. The case has a domed bezel and a screw-down winding crown, and the date sits under a Cyclops lens on the sapphire crystal. Inside is calibre 2236, a self-winding mechanical movement with a Syloxi hairspring in silicon and a power reserve of approximately 55 hours. Rolex certifies the watch as a chronometer. The silver dial has luminous hands and indices with a central seconds display. It is fitted to a steel Oyster bracelet with a folding Oysterclasp and an Easylink comfort extension link. The Twinlock crown seals the case to a depth of 100 metres.