The sectorized dial of the Duometre Chronograph Moon is extremely legible in terms of both design and function: moon phase on the chronograph counter, whose monopusher triggers start/stop/reset, day/night indicator on the left-hand hour counter, power reserves on either side of the seconde foudroyante at 6 o’clock. At the heart of this complication watch beats the Calibre 391, distinguished by its independent twin barrels and gear trains: one dedicated to the hour/minute indication, the other to complications. Offering different levels of finishing, Calibre 391 is a watchmaking spectacle to be admired under the sapphire crystal on the back of the timepiece.CASE Pink Gold 750/1000 (18 carats) Diameter: 42.5 mm Thickness: 14.2mm WATER RESISTANCE 5 bar DIAL Appliqued numerals, Silvered grey, Opaline STRAP Brown leather, Interchangeable: No Lug width: 21mm Length 12h: 75mm Length 6h: 120mm BUCKLE Pin buckle Pink Gold 750/1000 (18 carats) Buckle width: 18mm JAEGER-LECOULTRE CALIBRE 391 FUNCTIONS Moon phase, Seconds, Jumping seconds, Twin Power-Reserve, Chronograph, Hour - Minute, Chronograph's Second, Day/Night indicator MOVEMENT Manual winding, Components: 482, Vibrations per hour: 21600, Jewels: 54, Barrel: 2, Thickness: 8.24mm, Power reserve: 50 hours