During this time, the number of IWC in-house movements expanded exponentially. Calibre 5000 became the calibre 51000 and then 52000 families, including perpetual calendar and tourbillon models. A calibre 80000 family was developed for Ingenieur models. A calibre 59000 family was produced, used in several variations in large Portofino 8-day hand-wound models
Two extraordinarily complicated movement families also were developed, including the calibre 94000 family (used in constant force tourbillons and with astronomical displays). Also manufactured was the calibre 98000 family of movements, first with design cues from IWC’s earliest pocket watches and later as a base for certain complex repeater and tourbillon models.
IWC has evolved into a true movement manufacture, with not one or two in-house movements, but with a multitude of offerings. This reflects a true change in IWC – both back to its historic roots and also at the cutting-edge of current technical development.