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JLC 630

Calibre 630 was a compact quartz watch movement with a mechanical chronograph developed by Jaeger-LeCoultre and also used by IWC.


Introduced in 1987, Calibre 630 was the first member in the Jaeger-LeCoultre Mechaquartz family. It was a complicated movement, with 25 jewels. At the time, it was advertised as a revolutionary thin chronograph, measuring just 23.30 mm diameter and 3.70 mm thick. This made it 1/3 the volume of most contemporary chronograph movements and 40% smaller than the smallest equivalent movement on the market.

There are two motors in the calibre

  • One powers the main timekeeping hands at a frequency of 1 Hz
  • A second powers the mechanical chronograph at 4 Hz

Since the chronograph is mechanical, it has the same feel as a conventional chronograph movement, including mechanical zero reset. Yet the Mechaquartz was much more compact than a conventional automatic chronograph movement.

Calibre 630 differed from Calibre 631 in that it included a moon phase indicator.

Note There is conflicting information on the quartz frequency, with some sources claiming dual 1 KHz and 4 KHz crystals and others claiming 32 KHz. It is likely this confusion comes from the 1 and 4 Hz motors.


See Also




  • Hour, minute hands
  • Small seconds at 6 00
  • Moon phase indicator
  • Chronograph with 30 minute and 12 hour subdials at 9 00 and 3 00, respectively


  • H 3.70 mm
  • D 23.30 mm
  • 25 jewels
  • 233 components
  • Frequency 32 KHz

Production period:

jlc_630.txt · Last modified: 02.12.2022 20:38 by

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