Jaeger-LeCoultre Duomètre à Quantième Lunaire 40.5

Running an elaborate complication such as a calendar within a classic watch always has a detrimental effect on the precision of the time indications. However, the highly experienced watchmakers at legendary Swiss watch brand Jaeger-LeCoultre now come with a 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: 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.

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.

Technical details
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, age and phase of the moon (for both hemispheres), power reserve
Regulator power reserve

Dial
Crystalline grained
Pink gold appliques

Hands
 Hours and minutes : “leaf” type
seconds : baton type with pear-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 : 13.07 mm
18-carat pink 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
Chocolate-toned alligator leather with 18-carat gold pin buckle

Reference
Q6042521, 18-carat pink gold

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