Datejust 31 – M278274-0018

Screw-down, Twinlock double waterproofness system

Fluted bezel

The Rolex fluted bezel is a mark of distinction. Originally, the fluting of the Oyster bezel had
a functional purpose: it served to screw the bezel onto the case helping to ensure the
waterproofness of the watch. It was therefore identical to the fluting on the case back, which
was also screwed onto the case for waterproofness, using specific Rolex tools. Over time,
the fluting became an aesthetic element, a genuine Rolex signature feature. Today the fluted
bezel is a mark of distinction, in gold on this Datejust 31.

Mint green 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.

White Rolesor

Gold is coveted for its lustre and nobility. Steel reinforces strength and reliability. Together,
they harmoniously combine the best of their properties. A true Rolex signature, Rolesor has
featured on Rolex models since the early 1930s, and was trademarked as a name in 1933.
It is one of the prominent pillars of the Oyster collection.