Jaeger-LeCoultre Duomètre à Quantième Lunaire

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An immaculate Grand Feu enamel dial

The new version of the Duomère à Quantième Lunaire comes with a 40.5 mm case in 18-carat white gold, a perfectly well proportioned size. In keeping with the extremely high quality of its movement, it features an immaculate dial crafted in Grand Feu enamel. This spectacularly shiny, absolutely pure dial is extremely complex to create and results in a timepiece with a truly exceptional face.

Day, date month… Gear wheels, adjustments, energy… Because running such an elaborate complication as a calendar within a classic watch naturally has a detrimental effect on the precision of the time indications, the watchmakers at Jaeger-LeCoultre knew they had found in the Dual-Wing concept an instrument capable of creating a perfect alchemy: a calendar watch that was as accurate as a chronometer.

Arranged on the elegant and easily readable dial, the hours, minutes, seconds and moon-phase displays appear to make the Duomètre à Quantième Lunaire a classic watch model. But inside the case and partially hidden from view beats Calibre 381, a prodigious movement boasting unprecedented precision based on the Dual-Wing concept and which propels the watch firmly into the spheres of Haute Horlogerie.

The truly extraordinary appearance of the watch lies in the actual concept behind the Dual- Wing movement, which is distinguished by the presence of two independent energy sources, each with a 50-hour power reserve: the first, regulated by the escapement and the balance, is entirely dedicated to the precise measurement of the passing of time; whereas the second source of energy is devoted to the display of the functions: hours, minutes, seconds, calendar and moon phase. Their synchronisation is ensured by the jumping seconds hand mechanism.

This Duomètre à Quantième Lunaire brilliantly illustrates the extreme research undertaken in the laboratory-workshops of Jaeger-LeCoultre: this watch reaches the heights of precision with a jumping seconds hand moving in sixth of a second increments while displaying the date and the moon phase on a separate subdial.

Through in-depth study and a willingness to challenge the fundamental principles of horological theory, the Jaeger-LeCoultre specialists have succeeded in creating a calendar watch in accordance with the Dual-Wing concept – a principle featuring exceptional characteristics that enable a degree of rating precision that was previously the exclusive preserve of timepieces free of any complications.

Only the expertise accumulated over more than 180 years could thus enable Jaeger-LeCoultre to begin writing a new chapter in the history of Fine Watchmaking…

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Duomètre à Quantième Lunaire
Ref.: Q60435E1, 18-carat white gold  

Movement  

  • Mechanical manually-wound Jaeger-LeCoultre Calibre 381, crafted, assembled and decorated by hand
  • 21,600 vibrations per hour
  • 50-hour power reserve
  • 367 parts
  • 40 jewels
  • 7.25 mm thick
  • 33.70 mm in diameter
  • Two independent barrels  

Functions

  • Hours, minutes, seconds, and jumping stop seconds with zero/reset system, date, moon phase, power reserve
  • Regulator power reserve  

Dial

  • Grand Feu enamel  

Hands

  • Hours and minutes: “leaf” type
  • seconds : baton type with leaf-shaped counterweight  

Crowns

  • One crown to wind the watch and adjust the hours and minutes
  • One push-piece to adjust the date
  • One corrector to adjust the moon phase  

Case

  • ø 40.5 mm, thickness : 13.40 mm
  • 18-carat white gold
  • Polished and satin-brushed finish
  • sapphire crystal, cambered on the dial side, hardness no. 9, glareproofed on front and back
  • water resistance : 5 bar  

Strap

  • in blue alligator leather with 18-carat white gold pin buckle

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