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.
Calibre 630 was used in chronograph watches in the 1980's and 1990's, though not as widely as Calibre 631:
- Jaeger-LeCoultre Ladies Odysseus Chronograph
- IWC Porsche Design Titan Moonphase Chronograph
- IWC Ladies Da Vinci Moonphase Chronograph