Pre-SIHH 2012

Duomètre à Quantième Lunaire 40.5

A calendar watch that was as accurate as a chronometer

The Watch Quote™ - January 16th, 2012



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: 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 sundial.

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 178 years could thus enable Jaeger-LeCoultre to begin writing a new chapter in the history of Fine Watchmaking...

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Jaeger-LeCoultre Duomètre à Quantième Lunaire 40.5

Technical specifications


Movement :Duomètre à Quantième Lunaire 40.5 Technical specifications
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
Material :18-carat pink gold
Polished and satin-brushed finish
Crystal :sapphire crystal, cambered on the dial side, hardness no. 9, glareproofed on front and back
Water resistance:5 bar
Strap :in chocolate-toned alligator leather with 18-carat gold pin buckle
Reference :Q6042521, 18-carat pink gold

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