Rolex Datejust 31 in Oystersteel, M278240-0018 | Schwanke-Kasten Jewel

Reference

278240

Model case

Oyster, 31 mm, Oystersteel

Water-resistance

Waterproof to 100 metres / 330 feet

Bezel

Domed

Dial

Bright blue

Bracelet

Jubilee, five-piece links

Movement

Perpetual, mechanical, self-winding

Calibre

2236, Manufacture Rolex

Power reserve

Approximately 55 hours

Certification

Superlative Chronometer (COSC + Rolex certification after casing)

Diameter

31 mm

Material

Oystersteel

Bracelet material

Oystersteel

Winding crown

Screw-down, Twinlock double waterproofness system

Crystal

Scratch-resistant sapphire, Cyclops lens over the date

Clasp

Concealed folding Crownclasp

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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.

Bright blue 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.

The Jubilee bracelet

The design, development and production of Rolex bracelets and clasps, as well as the stringent tests they face, involve advanced high technology. And, as with all the components of the watch, aesthetic controls by the human eye guarantee impeccable beauty. The Jubilee, a supple and comfortable five-piece link metal bracelet, was designed and made especially for the launch of the Oyster Perpetual Datejust in 1945.

Model availability

All Rolex watches are assembled by hand with the utmost care to ensure exceptional quality.Such high standards naturally restrict Rolex production capacity and, at times, the demand for Rolex watches outpaces this capacity.

Therefore, the availability of certain models may be limited. New Rolex watches are exclusively sold by Official Rolex Jewelers, who receive regular deliveries and independently manage the allocation and sales of watches to customers.

Schwanke-Kasten Jewelers is proud to be part of the worldwide network of Official Rolex Jewelers and can provide information on the availability of Rolex watches.