For 2010 Jaeger-LeCoultre expands the Duomètre family with the addition of the 42mm Duomètre à Quantième Lunaire. This piece displays time with a jumping foudroyante seconds hand showing 1/6th of a second increments, along with the date and the age of the moon. The “dual-wing” movement 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.
The dual-wing architecture bypasses the problem of additional complications affecting the smooth flow of power to the escapement, and so allows precise timekeeping even in a very complicated watch. Though the new caliber 381 movement is complex, the displays are clear: hour and minute on the right hand side, date and moon phase on the left hand side, central seconds, and jumping seconds in the lower middle of the dial.
The movement is designed to achieve the highest possible precision for a mechanical movement. Each side or “wing” of the movement has its own barrel with a power reserve of 50 hours. Both springs are wound through the crown: rotating it clockwise winds the timing barrel (escapment); turning the crown counter-clockwise winds the power reserve for the functions (hour, minute, seconds, jumping seconds, date, moon phase). The watch features two seconds hands: one at the center, and the jumping seconds at 6 o’clock. The time is set via the crown. Pulling it resets both seconds hands to zero while leaving the escapement running. Pushing the crown activates both hands simultaneously by re-coupling into the running escapement. The movement also features a large balance wheel measuring 10 millimeters in diameter and a frequency of 21,600 vibrations per hour.
The Duomètre à Quantième Lunaire will be produced in a limited edition of 300 yellow gold watches priced at $35,100, and in an unlimited pink gold version priced at $33,700.