Rolex Datejust 31 mm

Rolex Datejust 31 mm, reference 278240-0012, in steel with a case diameter of 31 mm. The domed bezel sits above a mint green sunray dial, and the sapphire crystal carries a Cyclops lens over the date. Inside is the self-winding calibre 2236, a Rolex manufacture movement with a Syloxi hairspring and a power reserve of approximately 55 hours. As a certified chronometer, it carries Rolex's official rating for accuracy on the wrist. The screw-down crown uses the Twinlock double waterproofness system, and the hands and indices are luminous for legibility in low light. A steel bracelet with a concealed folding Crownclasp completes the watch. The Twinlock crown holds the case to its 100 metre rating.