On the Rolex Oyster Perpetual Yacht-Master 42, the bidirectional rotatable bezel is fitted with a 60-minute graduated Cerachrom insert in matt black ceramic. Its raised graduations and numerals are first moulded into the ceramic and then polished. The first 15 minutes are graduated minute-by-minute to allow time intervals to be read with great precision. The bezel can also be turned with ease thanks to its knurled edge, which offers excellent grip. #Rolex #YachtMaster #OfficialRolexRetailer #HLBrown #Sheffield