The Fantastic thing about Exact Movement

Oyster Perpetual Girl-Datejust in 18 ct yellow gold, bezel set with 46 brilliant-cut diamonds, white mother-of-pearl dial set with 10 diamonds. Picture: Rolex

The Oyster Perpetual Girl-Datejust is an icon on this planet of watches. It was launched in 1957, at a time the place girls had been altering — they had been having fun with new, lively life. They discovered a brand new sense of autonomy, and needed to manage their very own destinies and handle their time extra exactly. Hans Wilsdorf, founding father of Rolex, understood what the trendy lady needed, and so was born the Girl-Datejust.

Pioneering girls have at all times been a keystone within the historical past of Rolex. For the reason that earliest days of the model, they’ve impressed the creation and improvement of particular timepieces that will assist their quest for empowerment. The Girl-Datejust is a celebration of those that dare to prepared the ground. It embodies precision whereas combining basic magnificence and technical efficiency.

Designed for the slender wrists of girls, the Girl-Datejust incorporates a 28 mm Oyster case, assured waterproof to a depth of 100 metres (330 ft), and crafted from Oystersteel or 18 ct gold. Its sapphire crystal is just about scratchproof, with a Cyclops lens at 3 o’clock over the date. A number of dial variations can be found, in a wealth of supplies, colors, markers and motifs, offering the discerning lady with choices to customize her watch and make her assertion.

Landmark in Watchmaking

Hans Wilsdorf as soon as said of his enduring mission: “Girls need the very best of each worlds: a tiny watch and an correct motion. But, the smaller the watch, the harder it’s to make it correct.”

That is exactly why the Girl-Datejust was ‘impressed by audacity’, because it was a significant technical problem to provide such small exact actions within the twentieth century. Since its inception, Rolex has made numerous enhancements to the guts of the Girl-Datejust. Presently, it’s geared up with calibre 2236, a self-winding mechanical motion fully developed and manufactured by Rolex.

Calibre 2236

Rolex calibre 2236
Calibre 2236. Picture: Rolex

Launched in 2014 calibre 2236 is a self-winding mechanical motion fully developed and manufactured by Rolex, providing excellent efficiency when it comes to precision, energy reserve, resistance to shocks and magnetic fields, comfort and reliability. A consummate demonstration of know-how, this motion carries plenty of patents. Let’s delve deeper into this motion which is on the forefront of watchmaking know-how.

The guts of the Girl-Datejust

These with a ardour for watches know that in mechanical watches, the oscillator is the ‘guardian of time’, sustaining the precision of the watch via the interactions of the stability wheel and the hairspring.

The oscillator of calibre 2236 has a stability wheel with variable inertia regulated extraordinarily exactly through gold Microstella nuts, held firmly in place by a height-adjustable traversing bridge enabling very secure positioning to extend shock resistance. The oscillator can also be fitted on high-performance Paraflex shock absorbers, designed and patented by Rolex.

Paraflex. Picture: Rolex

The hairspring of a motion is a fragile part that’s topic to environmental disturbances that may adversely have an effect on the oscillator’s efficiency. Magnetic fields, temperature variances and shocks all serve to throw the oscillator off.

To supply larger stability within the face of those disturbances, Rolex developed the brand new Syloxi hairspring, including a second distinct paramagnetic stability spring know-how to finish its vary of high-performing hairsprings, alongside the blue Parachrom hairspring.

The Syloxi hairspring is fully manufactured in-house by Rolex from a silicon and silicon oxide composite, a mix of supplies whose thermo-compensating and paramagnetic properties permit the hairspring to take care of its excessive precision when subjected to temperature fluctuations and magnetic interference.

Utilising deep reactive ion etching know-how (DRIE), the hairspring is crafted with a patented geometry that optimises its isochronism and thus the regularity of the oscillations of the stability wheel-hairspring meeting. The variable pitch and thickness of the coils, optimised alongside the entire size of the hairspring, ensures fixed improvement in all positions, compensating for the consequences of gravity.

Inspecting the Syloxi would present a hairspring mounted to the stability workers and bridge utilizing a patented versatile collet, eliminating the necessity for glue and retaining the hairspring’s internal finish completely perpendicular, flat and self-centring.

Syloxi Hairspring
Syloxi hairspring. Picture: Rolex

Trying alongside the hairspring, one can see that the Syloxi terminates in a extra inflexible, bolstered crescent-shaped half that permits a two-point fixation to the traversing stability bridge, guaranteeing that the hairspring is completely centred, completely flat and freed from any residual mechanical stress in its lively zone.

Fixing it this manner allowed Rolex to optimise the beat adjustment utilizing a Paraflex shock absorber that incorporates a fluting for this objective, which can also be the signature of Syloxi-equipped calibres.

This marvel of precision engineering supplies the Syloxi with nice stability within the face of temperature variations; as much as 10 instances extra precision than a standard hairspring in case of shocks; and better resistance to magnetic fields.

Additionally of curiosity is that the calibre 2236 is supplied with a paramagnetic nickel-phosphorus escape wheel enhancing its resistance to magnetic fields.

Like all Rolex watches, the Girl-Datejust is roofed by the Superlative Chronometer certification redefined by Rolex in 2015. The precision of a Rolex Superlative Chronometer is of the order of −2/+2 seconds per day — the speed deviation tolerated by the model for a completed watch is considerably smaller than that accepted by COSC for official certification of the motion alone.

Perpetual Rotor
Perpetual rotor. Picture: Rolex

Every calibre 2236 is fitted with a self-winding module through a Perpetual rotor, which ensures steady winding of the mainspring by harnessing the actions of the wrist to offer fixed power. This presents an influence reserve of roughly 55 hours.

As with all Rolex actions, calibre 2236 is made in-house by Rolex, together with all parts.
A timepiece that encapsulates Rolex values, the emblematic Girl-Datejust has been a byword for type and technical efficiency ever since its launch, celebrating those that dare to prepared the ground.

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