Rolex Oyster Perpetual 31mm with a black dial and an Oyster bracelet.
The sunray finish creates delicate light reflections on many dials in the Oyster Perpetual collection. It is obtained using masterful brushing techniques that create grooves running outwards from the centre of the dial.
Light is diffused consistently along each engraving, creating a characteristic subtle glow that moves depending on the position of the wrist. Once the sunray finish has been completed, the dial colour is applied using Physical Vapour Deposition or electroplating. A light coat of varnish gives the dial its final look.
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.
The Oyster bracelet is a perfect alchemy of form and function, aesthetics and technology.
First introduced in the late 1930s, this particularly robust and comfortable metal bracelet with its broad, flat three-piece links remains the most universal bracelet in the Oyster collection. For the Oyster Perpetual models the Oyster bracelet is fitted with an Oysterclasp.
Model Case
Type
- Oyster, 31 mm, Oystersteel
Diameter
- 31 mm
Material
- Oystersteel
Bezel
- Domed
Oyster Architecture
- Monobloc middle case, screw-down case back and winding crown
Winding crown
- Screw-down, Twinlock double waterproofness system
Crystal
- Scratch-resistant sapphire, Cyclops lens over the date
Water Resistance
- Waterproof to 100 metres/ 330 feet
Movement
Type
- Perpetual, mechanical, self-winding
Calibre
- 2231, Manufacture Rolex
Precision
- -2/+2 sec/day, after casing
Oscillator
- Paramagnetic blue Parachrom hairspring. High-performance Paraflex shock absorbers
Winding
- Bidirectional self-winding via Perpetual rotor
Power reserve
- Approximately 55 hours
Functions
- Centre hour, minute and seconds hands. Instantaneous date with rapid setting. Stop-seconds for precise time setting
Bracelet
Type
- Oyster, three-piece solid links
Bracelet Material
- Oystersteel
Clasp
- Folding Oysterclasp with Easylink 5 mm comfort extension link
Dial
Type
- Black
Details
- Highly legible Chromalight display with long-lasting blue luminescence
Case reference 177200