The latest edition of the Master Hybris Artistica Calibre 945 has been reinterpreted in 18-karat white gold and limited to just five pieces
The skies and stars have always exerted a great deal of influence on watchmakers, inspiring creative timepieces designed to accurately chart their movements. Jaeger-LeCoultre is no stranger to celestial complications, having recently introduced a beautiful reinterpretation of its Master Hybris Artistica Calibre 945. First unveiled in 2010, this movement unites a star chart of the Northern Hemisphere, a minute repeater and a unique flying Cosmotourbillon, all housed within a new 18-karat white gold case.
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Above The Master Hybris Artistica Calibre 945, characterised by the exceptional depth of its deep blue dial (Photo: courtesy of Jaeger-LeCoultre)
The latest edition of the Master Hybris Artistica Calibre 945 features a multi-level domed dial that instils striking, three-dimensional depth, almost as if you are viewing the world from the heavens above. This is possible thanks to the Maison employing grisaille enamel, a decorative art introduced to its repertoire in 2022. This is the same technique used on its predecessors, such as the Calibre 945 ‘Galaxia’ and ‘Atomium’. It is an incredibly demanding and complex technique, utilising layers of individually fired enamel that eventually become a deep, mesmerising blue. The celestial motifs are then painted by hand with a white enamel known as Blanc de Limoges, rendering the constellations and their names with stunning clarity.

Above Comprised of 73 components, the Cosmotourbillon is held within a lightweight titanium carriage, beating at a frequency of 4 Hz (Photo: courtesy of Jaeger-LeCoultre)
The tourbillon is often regarded as a “romantic” complication, whose practical function has largely been overshadowed by horological advancements. Jaeger-LeCoultre’s Cosmotourbillon, however, serves a credible purpose. It is a celestial flying 60-second tourbillon that measures the passing of time by completing a circuit of the dial in one sidereal day, which is based on the Earth’s rotation relative to the stars (as opposed to the solar day we are familiar with, which is based on the sun). It tracks the real-time positions of the constellations from Vallée de Joux, which the Maison has called home since 1883.

Above The entire timepiece demands of Jaeger-LeCoultre’s watchmakers exceptional technical mastery and a clear artistic vision (Photo: courtesy of Jaeger-LeCoultre)
Alongside the Cosmotourbillon is a minute repeater distinguished by its gentle, exquisite chimes—another thoroughly demanding watchmaker technique. Operated from a slide on the left side of the case, its sound is produced by crystal gongs wrapped around the calibre and Trébuchet hammers, facilitated by a silent governor to ensure there are no disruptions. The result is a delicate yet audible sound that preserves the watch’s romantic roots.
The 45mm, 18-karat white gold case has been microblasted and refined with satin polish finishes. It is paired with a blue alligator strap, whose colour has been carefully matched to that of the dial. A patented, double-wheel adjustment mechanism allows for precise adjustments to ensure comfort on the wrist.

Above A deeper connection with the constellations above Vallée de Joux in Switzerland (Photo: courtesy of Jaeger-LeCoultre)
Jaeger-LeCoultre has described this as their latest “opus”—a fitting designation, given the level of care and precision involved in its creation. It is an exceptional translation of the celestial sky onto a physical timepiece, showcasing their artistry and our profound connection to the stars.
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