Oyster Perpetual 31

Oyster, 31 mm, Oystersteel

The Oyster Perpetual31 with a blue azzurrodial and an Oysterbracelet.

The aesthetics of the Oyster Perpetual models set them

apart as symbols of universal and classic style. They

embody timeless form and function, firmly rooted in the

pioneering origins of Rolex.

Blue DialA watchmaking technique

The sunray finish on Rolex dials is a predominant method

in watchmaking of achieving pure metallic colour dials

such as shades of silver grey, rhodium or ruthenium.

OystersteelHighly resistant tocorrosion

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 braceletAlchemy of form andfunction

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.

Perpetual RotorSelf-winding mechanism

In 1931, Rolex invented and patented a self-winding

mechanism with a free rotor, called the Perpetual rotor,

based on a principal that would later be adopted by the

whole watchmaking industry. The self-winding mechanism

consists of a half-moon shaped oscillating weight, which

pivots freely on its central axle, in one direction, then the

other with the natural movements if the wrist. It transmits

uninterrupted natural energy to the watch.

2231 MovementSuperlative performance

Calibre 2231 is a self-winding mechanical movement

entirely developed and manufactured by Rolex. Like all

Rolex Perpetual movements, the 2231 is a certified Swiss

chronometer, a designation reserved for high-precision

watches that have successfully passed the Swiss Official

Chronometer Testing Institute (COSC) tests. Its

architecture, in common with all Oyster watch movements,

makes it singularly reliable.

SpecificationsReference 177200

MODEL CASEOyster, 31 mm, Oystersteel

OYSTER ARCHITECTUREMonobloc middle case, screw-down case

back and winding crown

DIAMETER31 mm

MATERIALOystersteel

BEZELDomed

WINDING CROWNScrew-down, Twinlock double

waterproofness system

CRYSTALScratch-resistant sapphire

WATER RESISTANCEWaterproof to 100 metres / 330 feet

MOVEMENTPerpetual, mechanical, self-winding

CALIBRE2231, Manufacture Rolex

PRECISION-2/+2 sec/day, after casing

FUNCTIONSCentre hour, minute and seconds hands.

Stop-seconds for precise time setting

WINDINGBidirectional self-winding via Perpetual

rotor

POWER RESERVEApproximately 48 hours

BRACELETOyster, flat three-piece links

BRACELET MATERIALOystersteel

CLASPOysterclasp

DIALBlue azzurro

CERTIFICATIONSuperlative Chronometer (COSC + Rolex

certification after casing)

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