Rolex Oyster Perpetual 31 mm

The Rolex Oyster Perpetual 31 mm, reference 277200-0017, has a steel case measuring 31 mm across. The case carries a domed bezel and a screw-down crown, with a sapphire crystal over the med blue dial. Inside is the self-winding calibre 2232, a Rolex manufacture movement with 55 hours of power reserve, certified as a chronometer. The dial has a central seconds hand and luminous hands and indices for legibility in low light. This is a compact dress watch built on Rolex's Oyster architecture, with a monobloc middle case and screw-down back. It comes on a steel Oyster bracelet fitted with a folding Oysterclasp and an Easylink comfort extension link. The screw-down crown, part of the Twinlock system, helps keep the case waterproof to 100 metres.