This year, Jaeger-LeCoultre, which has celebrated every decade (and even a few lustres) of its iconic watch since 1991, is celebrating 90 years of the Reverso. As has been the tradition for the past 30 years, it does so with a complicated model. It is the Reverso Hybris Mechanica Quadriptyque Calibre 185, the fruit of more than six years of development, to represent on a single watch the indications relating to cycles (the synodic cycle, the draconic cycle and the anomalistic cycle) and lunar phenomena, such as Supermoons and eclipses. The connection between the case, where the motor of the movement, which provides the energy for all the indications, resides, and the support where the mechanism relating to the lunar cycles is housed, cannot be continuous, as the case of the Reverso must be able to slide on the slide and be tilted at will. Very slow displays must therefore be placed in the support. Those relating to the moon are perfect, as they require only one operation per day. At 7 o'clock on the main dial, the one we see when the watch crown is on the right, we find the flying tourbillon, equipped with a high-frequency balance-spiral (28,800 vibrations per hour). The tourbillon regulator is set on a dial displaying an instantaneous perpetual calendar. 
The big date is made with a new mechanism specially developed for this watch and is located at 5 o'clock on the same dial. This grand complication is flanked by another, the most prestigious one: the minute repeater, whose mechanism is visible through the second face of the rotating case, where the same hour indication as on the main dial is reproduced in jumping format for the hours and snapped for the minutes. Finally, the Moon. The indications relating to our satellite are all displayed on the two sides of the Reverso's support, to which the strap is attached. The mechanism inside the support is activated once a day, by a pinion which, coming out of the case, fits into a hole on the element corresponding to the lugs, at 12 o'clock. On the inner surface of the support, on which the case rests, are affixed the synodic cycle, the draconic cycle and the anomalistic cycle of the Moon, and the representation of the phases of the Moon in the northern hemisphere, given with precision over a cycle of 1,111 years, stands out. A 3D micro-sculpted rose gold Sun, around which a small hemispherical Moon orbits, shows the draconic cycle, which specifies when the Moon's path crosses the Earth's orbit around the Sun (ecliptic). To the right of the draconic cycle counter we observe a domed representation of the Earth, made in enamel using the micropainting technique, with a hemispherical Moon drawing an eccentric orbit around it. This counter represents the anomalistic cycle, showing the variable distance between the Earth and the Moon. At apogee, the Moon is at its farthest point, at perigee it is at its closest point. If the Moon is full when it passes perigee, a phenomenon known as Supermoon occurs, in which the celestial body can appear up to 14% larger than normal. The display of the synodic, draconic and anomalistic cycle in a single wristwatch is a first. Finally, on the less easily visible side of the Hybris Mechanica Quadriptyque (because you have to unhook the watch from your wrist to observe it) is the moon phase display in the southern hemisphere. Most of the moon phase indications and a starry sky chart, engraved and lacquered in a palette of blue hues, serve as a backdrop to the rose gold moon. The watch, produced in only 10 pieces, has a white gold case, combined with a crocodile strap.
Price: on request.
