Essential Rolex The Rolex Oyster Perpetual is the purest expression of the brands watchmaking heritage. With its clean design and reliable performance, it offers timeless appeal in its most elemental form. Everyday Precision This 2021 reference features a black dial with baton hour markers and a domed bezel. The 36mm Oystersteel case is paired with an Oyster bracelet and Easylink Oysterclasp. Inside, the calibre 3230 automatic movement delivers a 70-hour power reserve and exceptional chronometric performance.