Master Ultra Thin 1907 and Master Ultra Thin Grand Feu : The immaculate purity of time


Master Ultra Thin 1907: elegance and technical accomplishment in the world of thin watches

The extra-slim pink gold case of the Master Ultra Thin 1907 watch is shaped like a knife-blade, a design that endows this timepiece with an even thinner profile. The engineers and watchmakers of the Manufacture meticulously studied each movement component and each case element in order to save precious millimetres at each stage of production. Nonetheless, at no stage does this asceticism compromise beauty. Loyal to its history, one part of which was written in the City of Light and the other in the splendid isolation of the Vallée de Joux, the Manufacture knows very well that the watchmaking art represents both a technical and an aesthetic accomplishment. The minimalist philosophy behind the Master Ultra Thin 1907 watch is thus expressed in a 39 mm-diameter case designed to smoothly embrace the curve of any wrist. This relatively modest size required the Jaeger-LeCoultre specialists to achieve even greater feats in designing and building a Fine Watchmaking movement able to fit within such a comparatively small case.

The manually-wound Jaeger-LeCoultre Calibre 849 is a marvel of finesse entirely crafted, assembled and decorated by hand in the complications workshop of the Manufacture. It comprises 123 parts, has a 35-hour power reserve and is equipped with a balance that steadily beats at a frequency of 21,600 vibrations per hour. In keeping with grand watchmaking traditions, it also displays the hours and minutes via central hands with the legendary precision of Jaeger-LeCoultre movements, despite measuring a mere 1.85 mm thick.

The dial of the watch is the aesthetic embodiment of this horological minimalism. Two dauphine-type hands sweep smoothly over the grained white dial punctuated by baton-type hour-markers that are doubled at 3, 6 and 9 o’clock. The minutes dots between two hour-markers are dusted with pink gold, while the Jaeger-LeCoultre signature crowned with the JL logo appears at 12 o’clock. After a slow and gentle process of maturation, horological essentials are thus expressed in a few concise lines – a privilege that remains the exclusive preserve of true masters. The Master Ultra Thin 1907 watch comes with an alligator leather strap that is secured by an 18-carat pink gold pin buckle.

Master Ultra Thin Grand Feu 

Driven by the same ultra-slim movement, the Master Ultra Thin Grand Feu watch is the interpretation of the Master Ultra Thin 1907 intended for art enthusiasts wishing to encircle their wrist with a timepiece featuring a white gold dial that illustrates one of the traditional skills passionately cultivated by the Grande Maison. Few indeed are the artisans still capable of mastering the Grand Feu enamelling technique, which involves firing the watch face that has been meticulously coated with successive layers of enamel at very high temperatures generally ranging from 800 to 900 degrees Celsius. This extreme heat entails the danger of irrevocably ruining the work in progress, since only a reliable sense of instinct and longstanding experience can enable the artisan to determine the exact moment when the gold dial disc should be removed from the kiln. The case of the Master Ultra Thin Grand Feu, also crafted from white gold, features the same blade-shaped profile, although its thickness has been marginally increased to 5.04 millimetres in order to accommodate beneath the sapphire crystal the various enamel layers applied to the timelessly elegant dial. The latter bears the inscription “Émail grand feu” appearing between the 7 and 8 o’clock numerals. This time-honoured handcrafted technique ensures that the watch is an authentic work of art that will maintain its initial appearance and radiance unchanged for centuries.

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