Jaeger-LeCoultre presents the Master Grande Tradition Calibre 948


Jaeger-LeCoultre presents the Master Grande Tradition Calibre 948

Master Grande Tradition Calibre 948

When The Métiers Rares® adorn universal time
La Cote des Montres - April 1st, 2022

Since the 1930s, Jaeger-LeCoultre has been creating timepieces able to display several time zones simultaneously. From dual-time watches to the Géographique and the remarkable Calibre 948 world timer, La Grande Maison makes time truly universal. For 2022, Jaeger-LeCoultre presents a magnificent new artistic interpretation of the Universal Time: Master Grande Tradition Calibre 948, embellished with great finesse by the artisans of the Manufacture’s Métiers Rares® atelier.

  • A new expression of the world-time complication unites artistry and technical prowess
  • Multiple skills from the Manufacture’s Métiers Rares® atelier are brought together to create the domed, open-worked and enamelled dial – the product of 70 hours of work
  • The Universal Tourbillon rotates in 60 seconds and makes a complete circuit of the dial in 24 hours
In the long history of timekeeping, time zones are relatively recent concept – but, like all measurements of time, have their origins in astronomy. The passage of our 24-hour day is based on the solar cycle, which is determined by the rotation of Earth on itself and its orbit around the Sun. Thus, as early navigators and explorers discovered, sunrise and sunset occur at different times in different places. With the development of maritime trade in the 18th century and railway travel in the 19th century, the need became clear for standardised timing – the synchronisation of clocks within a given geographical region – and for global norms to be established.

At the International Meridian Conference in 1884, it was decided that the Greenwich Observatory in London would be the prime meridian (longitude 0°) as the standard of time reckoning around the globe. Longitudes would be calculated both east and west from Greenwich up to 180° and the world’s universal day would be the Mean Solar Day, starting and ending at midnight at Greenwich and counted east and west from there – hence the terms ante meridian (am) and post meridian (pm). These resolutions were later formalised to create the 24 major time zones, each defined by 15 degrees of longitude.

When Jaeger-LeCoultre created the Calibre 948, it was the first time that a world-time complication had ever been united with a flying tourbillon. What’s more, the Universal Tourbillon makes a complete circuit of the dial every 24 hours – the length of a mean solar day. A true expression of Jaeger-LeCoultre’s technical expertise, the automatic calibre was conceived, developed and entirely produced within the Manufacture. The splendid new aesthetic expression of the world-time complication showcases La Grande Maison’s artistic creativity and mastery of the decorative crafts alongside its technical prowess.


A World of Time on the dial


In a subtle allusion to the depth and complexity of time measurement, the dial is made of several parts. At its centre, in keeping with world-timer tradition, is a map of the world as seen from the North Pole. However, unlike the traditional flattened image, this map floats above the dial bed on a domed skeleton formed by the longitudes and latitudes of the Northern Hemisphere. Created by the master artisans of the Manufacture’s Métiers Rares® (Rare HandcraftsTM) atelier, the outline of the continents is cut from a sheet of white gold and decorated with champlevé enamel.

Champlevé – which translates literally as “raised field” – is a noble and ancient enamelling technique that was first practiced almost 2,500 years ago. With great skill, the artisan must first carve out a depression in the raw metal, conforming exactly to the outline of the desired image – in this case, the shapes of the continents seen from the North Pole. This hollow area is then filled with multiple layers of enamel – fired at very high temperatures after each layer – until it is flush with the original surface. On the completed enamel surfaces, miniature-painted details of the continents’ major landscape features have been painstakingly added, enhancing the work with even greater intrigue and refinement.

For the new Master Grande Tradition Calibre 948, the enamelling of a single dome requires 55 hours of work. Measuring just 25.5mm in diameter, each dial is a remarkable work of art in miniature, requiring almost 70 hours of meticulous work altogether.

Beneath the dome, representing the oceans, the dial bed is a disc of vivid blue translucent lacquer applied over a wavy guilloché pattern that suggests the movement of the sea and the lunar influence on its tides. In circular aperture to one side of the map, the flying tourbillon appears to float weightlessly above the blue oceans, spinning in 60 seconds.

As on all classical world timers, each time zone is represented by the name of a city, arranged in a ring around the central dial. Set outside the city ring are two concentric fixed rings: a 24-hour indicator with applied numerals and rectangular indexes, and a minute track laser-engraved on a ring of blue lacquer that matches the blue oceans. Mimicking the rotation of Earth on its axis, the domed Earth map – together with the Universal Tourbillon and city ring – makes a complete 360-degree revolution in 24 hours, always indicating the right time in each city.

The Master Grande Tradition Calibre 948 is very simple to read: the hour marked on the ring adjacent to the city name is the time in that city’s zone. It is equally simple to operate: the time is set with the crown, which synchronises all of the time zones around the world. On arrival at a new destination, local time is set by the same crown, which moves only the hour hand, in one-hour jumps forwards or backwards, allowing the minutes and seconds to continue running accurately.

The Master Grande Tradition case is a perfect complement to the dial. Comprising more than 80 parts, its convex bezel contrasts with broad bevels on the lugs, and the hollowed-out lug sides add dynamic tension. Different surfaces are microblasted, polished and satin-brushed to maximise the play of light.

Blending art and mechanics, the new Master Grande Tradition Calibre 948 is testament to Jaeger- LeCoultre’s dedication to maintaining the fine balance between a passionate drive to innovate and profound respect for tradition.

The Stellar Odyssey


In 2022 Jaeger-LeCoultre pays homage to the astronomical phenomena that lie at the very origin of how mankind measures time. Since the earliest days of the Manufacture, astronomical functions have played a major role in Jaeger-LeCoultre’s portfolio of complicated timepieces – ranging from simple forms of moon phase display to highly complex perpetual calendars, equation of time, sky charts, and the draconic and anomalistic lunar cycles. Mastering all three measures of time – solar, lunar and sidereal – the watchmakers of La Grande Maison have perpetually innovated to create the most advanced and precise mechanisms that represent or even predict celestial phenomena. This year, Jaeger-LeCoultre embarks on a Stellar Odyssey with an immersive exhibition and a series of themed events that will embrace inspirational collaborations with a visual artist and a mixologist, and a fascinating programme of celestially-themed Discovery Workshops at Atelier d’Antoine. The Stellar Odyssey is an invitation to discover how the mysteries of the cosmos are translated into micro-mechanical wonders for the wrist.

Grande Tradition
Calibre 948

Technical details

Reference :Q52834E1
Limited edition :20 pieces
Case :White gold
Case-back :Sapphire
Dimensions :43 mm x 14.13 mm
Movement :Jaeger-LeCoultre Calibre 948
Automatic mechanical
Frequency :28,800
Power reserve : 48 hours
Dial :Blue translucent lacquer over a wavy guilloche pattern
Domed skeleton structure decorated with champlevé enamel
Water resistance :5 bar
Functions :Hours and minutes
Universal flying tourbillon
rld-time display (24 time zones)
24-hour indication
Bracelet:Alligator leather
Clasp :Deployant buckle