The Yacht-Master II features a bidirectional rotatable bezel fitted with a 60-minute graduated Cerachrom insert in blue ceramic. Extremely hard and virtually scratchproof, the high-technology ceramic used by Rolex requires special tools for its machining. Its stable colour is unaffected by ultraviolet rays, and thanks to its chemical composition, this ceramic is inert and cannot corrode. On this blue Cerachrom insert, the moulded, recessed graduations and numerals are coated with platinum or yellow gold via PVD (Physical Vapour Deposition). The first half hour of the graduation is set out minute by minute. With the bezel in the neutral position, the final 30 seconds of the countdown can be read in more detail via the chronograph centre seconds hand. The graduated bezel, whose knurled edge offers excellent grip, also allows the wearer to easily measure time intervals – for example, the sailing time between two buoys.

The display ensures clear readability of the various functions. The dial is coated with a new white lacquer – matt, to reduce reflections – and carries the applique index hour markers emblematic of Professional category watches. A flange, dedicated to the countdown function, is positioned extremely precisely on the dial – an attribute for which a patent application was filed. It is graduated from 10 to 0 minutes, with the half minutes shown as triangles.

Rolex uses Oystersteel for its steel watch cases. Specially developed by the brand, Oystersteel belongs to the 904L steel family, alloys most commonly used in high-technology and in the aerospace and chemical industries, where maximum resistance to corrosion is essential. Oystersteel is extremely resistant, offers an exceptional finish once polished and maintains its beauty even in the harshest environments.