Next month at SIHH Jaeger-LeCoultre will introduce the new Duomètre à Quantième Lunaire 40.5 – a slightly smaller version of the original 42.5mm watch that debuted in 2010. The new model’s case measures 13.07 mm thick and is 18k pink gold. Production is not limited.

Jaeger-LeCoultre’s goal with the Duomètre series is to develop complicated watches that keep time with great accuracy. The goal is achieved by means of the Caliber 381′s “dual-wing” design which features two independent power supplies: one regulated by the escapement and balance, and the other for the time, date and age of the moon displays. This arrangement takes the complications out of the power loop, so to speak, allowing a smooth flow of energy to the escapement. As an added horological bonus, this piece incorporates a jumping foudroyante seconds hand showing 1/6th of a second increments.

Complete technical specifications appear below the image.

Technical Specifications

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
• in chocolate-toned alligator leather with 18-carat gold pin buckle

Reference
• Q6042521, 18-carat pink gold