Rolex

Datejust 31

Oyster, 31 mm, Oystersteel

M278240-0005

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M278240-0005-on-wrist
  • REFERENCE

    278240

  • MODEL CASE

    Oyster, 31 mm, Oystersteel

  • BEZEL

    Domed

  • WATER RESISTANCE

    Waterproof to 100 metres / 330 feet

  • MOVEMENT

    Perpetual, mechanical, self-winding

  • CALIBRE

    2236, Manufacture Rolex

  • POWER RESERVE

    Approximately 55 hours

  • BRACELET

    Oyster, three-piece solid links

  • DIAL

    Silver

  • CERTIFICATION

    Superlative Chronometer (COSC + Rolex certification after casing)

Silver dial

Silver dial

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.

Oystersteel

Oystersteel

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.