Jaeger-LeCoultre Master Control Q4142520 40 mm Gold Dial

The Master Control Q4142520 brings a 40 mm round case in rose gold to the collection's calendar-and-moon-phase format. At 10.95 mm thick, it has enough presence for the gold sunburst dial, whose applied markers frame the date, day, month, moon phase and seconds. A pin buckle gives the reference a traditional closure beside its steel siblings, while the see-through caseback and 50 metres of water resistance retain the practical and mechanical balance of the range.

Automatic Calibre 866 is an in-house movement with a 70-hour power reserve, 344 parts and 34 jewels. It measures 6.15 mm high, runs at 4 Hz through a silicon escapement and uses a full rotor. Its calendar mechanism includes the day, date, month, moon phase, jumping date and small seconds. Its fine finish is visible through the display back, while the cased watch undergoes the 1000 Hours Control.