On the one hand, there’s the Doppelchronograph, developed within the 1990s by Richard Habring to operate on a modified Valjoux 7750 motion. Alternatively, there’s the IWC perpetual calendar. The unique work of watchmaking legend Kurt Klaus within the 1980s introduced an egalitarian enchantment to a complication lengthy related to status and nice expense, and likewise did so on the again of the standard Valjoux 7750.
As we speak, we’re a brand new batch of IWC Portugieser Perpetual Calendars that are available a 42mm measurement made doable by the mixing of a perpetual calendar motion within the 82000-caliber household. That is the primary time that this barely smaller household of actions has powered an IWC perpetual calendar mechanism.
