IWC · Quartz

633

A mechaquartz calibre from the Jaeger-LeCoultre 630 family, supplied to IWC and fitted from 1991 to 1997 to the Ingenieur Chronograph Alarm. Quartz regulates the timekeeping while the chronograph runs on a conventional mechanical module, which gives the crisp mechanical reset without a mechanical rate. The alarm is what separates the 633 from the 630 and 631 alongside it in the same family.