Jaeger-LeCoultre Duomètre à Quantième Lunaire

Introduced in 2010, the Duomètre à Quantième Lunaire watch is the second creation based on Jaeger-LeCoultre’s Dual-Wing concept, developed to enhance the autonomy and precision of mechanical complication watches.

The Dual-Wing system separates the provision of energy to the complication from that of the movement which is fed by its own barrel in order to guarantee the constancy of its energy supply.

First unveiled in 2007, it enabled Jaeger-LeCoultre to reinvent the chronograph by endowing the Duomètre à Chronographe with chronometer-worthy precision, while displaying the time thus counted off to the nearest 1/6th of a second. It was then given a new application in 2010 on the JLC Duomètre à Quantième Lunaire, guaranteeing this model exceptional accuracy and making it the first watch enabling 1/6th of a second time adjustment without interrupting the operation of its regulating organ.

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.

Jaeger-LeCoultre Duomètre à Quantième Lunaire

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: 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 phases for both hemispheres. Their synchronisation is ensured by the jumping seconds hand mechanism.

The Jaeger-LeCoultre Duomètre à Quantième Lunaire 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.

Technical details

Model: Jaeger-LeCoultre Duomètre à Quantième Lunaire

Ref. Q6042420: Pink Gold
Ref. Q6040420: Yellow Gold, limited edition of 300 pieces

Jaeger-LeCoultre Calibre 381
Mechanical hand-wound
Number of pieces: 369
Vibrations per hour: 21600
Power-reserve: 50 Hours
Jewels: 40
Barrel: 2
Height: 7.25 mm

Hour – Minute
Twin Power-Reserve
Moon phases
Jumping seconds

18 carat pink or yellow gold
Diameter: 42mm
Water resistance: 5 bar

Hands: Feuille

Alligator leather strap with double folding buckle, 20.0 mm