Duomètre Chronograph Moon Platinum / Copper

In Context

At 42.5 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 14.2 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 50 m covers rain and hand-washing comfortably; it is not a watch to swim in.

The movement is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 50 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 21,600 vph the seconds hand advances 6 times a second, the slower and more audible rate of an older design.

Q622656J stands on its own in this catalogue — no other reference here shares its base number. It pairs a pink matte dial with a pink gold case. Beyond the time it carries a chronograph.

The Jaeger-LeCoultre Calibre 391 is a hand-wound chronograph movement developed and manufactured entirely in-house. It is based on the Duometre concept introduced in 2007, featuring two independent barrels and gear trains—one dedicated to timekeeping, the other to complications—connected by a shared escapement. This architecture ensures high precision even during chronograph operation. Calibre 391 integrates a monopusher chronograph with central seconds and a foudroyante (jumping seconds) at 6 o’clock, along with a 30-minute counter at 3 o’clock. Additional functions include a moon phase display, a day/night indicator, and dual power reserve indicators. The movement runs at a frequency of 21,600 vibrations per hour (3 Hz), has a power reserve of approximately 50 hours, and comprises 482 components, including 54 jewels. It measures 33.7 mm in diameter and 8.24 mm in height.

1 other watch in the library runs the Jaeger-LeCoultre 391.

Jaeger-LeCoultre

Duomètre Chronograph Moon Pink Gold / Silver

Q622252J · 42.5 mm