One of this year’s news is Rolex’s Oyster Perpetual Sea-Dweller 4000, which is a modern version of the famous model from 1967. The steel case has a diameter of 40 mm. The watches are designated for divers, so they are waterproof to a depth of 1220 metres. The case is fitted with a uni-directional rotatable black Cerachrom bezel. The 60 minute scale engraved on the bezel is protected by a layer of platinum and allows you to safely and accurately monitor your dive time and decompression times.