Reverso Gyrotourbillon 2

ref. 2332420

This watch turns a new page in the history of the spherical tourbillon; here it has a cylindrical balance-spring that ensures the accuracy of a movement whose exceptional finish testifies to Jaeger-LeCoultre’s mastery of the decorative crafts.

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Cylindrical balance-spring, Jaeger-LeCoultre Calibre174

Cylindrical balance-spring, Jaeger-LeCoultre Calibre174

The cylindrical balance-spring is used in a wristwatch for the first time. Its shape makes Calibre 174 more isochronous and allows it to have two terminal curves to ensure more even motion with each vibration in pursuit of a single goal: greater accuracy.
Exceptional decoration, Reverso Gyrotourbillon 2

Exceptional decoration, Reverso Gyrotourbillon 2

Nickel silver bridges and plates, Côtes de Genève and Clous de Paris finishes, drawn and chamfered bridges, blued screws: the Reverso Gyrotourbillon 2 has finishes that meet watchmaking’s highest standards. A watch of rare beauty, a fit setting for the famous spherical tourbillon.
Spherical Tourbillon, Jaeger-LeCoultre Calibre 174

Spherical Tourbillon, Jaeger-LeCoultre Calibre 174

An ever more sophisticated spherical tourbillon escapement: higher frequency, greater balance inertia, cylindrical balance-spring, and faster carriage rotation.
The Spherical Tourbillon

The Spherical Tourbillon

In Jaeger-LeCoultre’s Calibre 177, the three-dimensional rotations of the balance-wheel are at the very heart of an extraordinary horological invention. The ultra-light external carriage makes a complete turn about its axis every sixty seconds. The internal carriage which supports the balance-wheel, balance-spring and escapement rotates far more rapidly – every 24 seconds to be exact, hence completing 2.5 turns per minute. To be sure, Jaeger-LeCoultre’s master-watchmakers did not settle on this unusual rotation speed by chance. In fact, it means that the gold balance-wheel appears once every minute in all its glory before the eyes of the observer, before continuing its progress, as though weightless, but following a carefully pre-planned course through the microcosm of the spherical tourbillon, which is of infinite lightness – the total weight of the 90 parts composing this complex rotating body is only a third of a gram. It would have been impossible to achieve this weight, worthy of all the superlatives, without recourse to aluminium for the spherical external carriage and to titanium and aluminium for the elements of the internal carriage. Thanks to the exceptional lightness of aluminium, the external body weighs just 0.035 grams. In steel the same part would weigh 0.11 grams. Aluminium is used in aeronautics and in high-performance engines, and, because of its exceptional density/resistance to corrosion ratio, is perfectly suited to use in a tourbillon. In any case, this is not the first time the master-watchmakers of Jaeger-LeCoultre have used this metal. In their ongoing pursuit of innovation, they had already experimented in the 1940s with movement prototypes made entirely of aluminium. Only in the case of the balance-wheel have Jaeger-LeCoultre’s technicians not skimped on weight. Along with its setting screws, the balance-wheel is made of 14-carat gold in order to obtain a particularly high force of inertia, which is useful in such unusual oscillation mechanisms. The spherical tourbillon of Jaeger-LeCoultre Calibre 174, of the Reverso Gyrotourbillon 2, embodies new groundbreaking progress in this extremely complex domain. A mechanical marvel in its right, this spherical tourbillon and the hundred or so parts composing it exercise an irresistible fascination by the complexity, speed and beauty of its three-dimensional motion. Its frequency has been increased to 4Hz (compared with 3Hz of the Jaeger-LeCoultre Calibre 177 of the Gyrotourbillon 1). It has been fitted with a cylinder-shaped balance-spring, such as is found in marine chronometers. Contrary to flat balance-springs, this cylinder-shaped balance-spring is fitted with two end curves, one on each end, thus ensuring a perfectly concentric beat. These twin characteristics – a high frequency and a concentric balance-spring – considerable improved precision. Its inner, faster carriage rotates at the speed of 3,2 complete turns per minute, meaning one revolution every 18.75 seconds, and its ultra-light aluminium-made outer carriage performs one turn per minute. Other specific technical characteristic of this model lies in the barrel, which is equipped with a torque-restricting device. This means that the regularity of rating is perfectly guaranteed for a full 50 hours: when the torque is too low, the restrictor comes into action and stops the watch running. This same restrictor also locks manual winding if there is a risk of supplying excess energy. Eager to enliven still further the visual enchantment of this horological mechanism, the designers of the Manufacture enhanced its appeal by delicately open-working the spokes of the balance-wheel, an operation that creates an elegantly slender effect and also implies a considerable reduction in weight.
Jaeger-LeCoultre Calibre 174 à Gyrotourbillon 2 Mechanical Calibre

Jaeger-LeCoultre Calibre 174 à Gyrotourbillon 2 Mechanical Calibre

* Movement:
* Mechanical manually-wound Jaeger-LeCoultre Calibre 174, crafted, assembled and decorated by hand
* Thickness 11.25 mm
* Parts: 371
* Jewels: 58
* Power reserve: 50-hour

Spherical tourbillon:
A key feature of the Gyrotourbilon 2: the cylindrical balance-spring with end curves

The second version of the Gyrotourbillon is distinguished by an essential organ: the presence of a cylinder-shaped balance-spring with end curves. This component was invented by English watchmaker John Arnold, who had it patented in 1782. Due to the complexity involved in its production and the difficulties implied by attempts to miniaturise it, this ingenious discovery which guarantees a regular and perfectly isochronous development of the balance-spring was reserved exclusively for marine chronometers and a few generously sized pocket-watches. Innovative watchmakers chafed at this regrettable situation, since its rating characteristics are unanimously considered to be infinitely better than those of a flat balance-spring.

The engineers and watchmakers of the Manufacture proved able to grasp the opportunity represented by the spherical tourbillon and to present a cylindrical balance-spring nestling at the heart of a wristwatch. Combined with the specific advantages of the spherical tourbillon, this innovation represents a breakthrough in the field of accuracy and paves the way for a level of rating precision that is simply unprecedented on a timepiece designed to follow its wearer’s arm movements.

* Outer carriage: aluminium, 60 seconds for a complete rotation
* Inner carriage: titanium and aluminium, 18.75 seconds for a complete rotation
* Balance: inertia of 12.5 mg x cm2
* Balance frequency: 28,800 vibrations per hour
* Parts:100

Technical details

Case material:
Pink Gold
Alligator Leather
Jaeger-LeCoultre Calibre
  • 174
  • Hand-winding
  • Number of pieces : 373
  • Vibrations per hour : 28800
  • Power-reserve : 50 Hours
  • Jewels : 58
  • Barrel : 1
  • Height : 11.10 mm
Front functions
  • Hour - Minute
  • 24-hour display
  • Seconds
  • Spherical tourbillon
Back functions
  • Movement operating indicator
  • Pink Gold
  • Water resistance : 3 bar
  • Dimensions (L x W) : 55x36mm
  • Thickness : 15.8mm
Front dial
  • Enamel white enamelled yellow gold
Back dial
  • Rhodium-plated white gold
Front hands
  • Bâton
Back hands
  • Bâton
  • Alligator Leather
  • Double Folding Buckle 20.0 mm

Jaeger-LeCoultre Calibre 174