IWC · Quartz

630

The base calibre of Jaeger-LeCoultre's mechaquartz family, supplied to IWC and used in the Kleine Da Vinci, reference 3736, in a 29 mm case. Quartz regulates the rate while a conventional mechanical module drives the chronograph, so the counters snap back on reset the way a mechanical chronograph does. IWC turned to the layout for small chronographs, where a fully mechanical calibre of the period would not fit.