Jaeger-LeCoultre Master Control Q4138130 40 mm Grey Dial

The Master Control Q4138130 gives its 40 mm stainless-steel round case a 12.05 mm profile, leaving room for a calendar chronograph display. The grey sunburst dial uses applied markers and pushers to frame a 30-minute counter, chronograph seconds, pulsometer, date, day, month and moon phase. The see-through back links the dial and movement; a deployant clasp and 50 metres of water resistance complete the specification.

Calibre 759 is an in-house automatic chronograph movement measuring 25.6 mm in diameter and 6.85 mm in height. It contains 367 parts and 36 jewels, runs at 4 Hz and provides 65 hours of power reserve. The movement uses a full rotor, a column wheel and a vertical clutch, with Cotes de Geneve on the bridges visible through the caseback. Its calendar functions include the day, date, month and moon phase, alongside the chronograph and small seconds.