Fast becoming a brand icon, the Duomètre à Quantième Lunaire is one of the most interesting, technically thoughtful and downright impressive lines from Jaeger-LeCoultre. The incredibly poetic name highlights two key aspects of the watch.
The term quantième lunaire is well known terminology in the watchmaking world referring to the dual displays of date – quantième – as well as the moon phases – lunaire. Duomètre is a designation invented by Jaeger-LeCoultre to describe the patented ‘dual wing’ concept of its Caliber 381.
Essentially all Duometre watches from JLC have two distinct power sources, each with a 50 hour power reserve. The first, regulated by the escapement and balance, is dedicated completely to timekeeping. The second source of energy is devoted to the display of the secondary functions such as the display of hours, minutes, seconds, calendar, and moon phase. The goal is to optimize accuracy by delinking the measurement of time from its display.