IWC Grande Complication

About this reference

The IWC Grande Complication reference 3770-25 in 18k pink gold was produced during the 1990s and early 2000s as part of a limited annual production run of 50 pieces per year across all metals. Collectors target this reference for the caliber 79091 movement, which integrates a perpetual calendar, moon phase, minute repeater, and chronograph within a 42.2mm case. The dial features four sub-dials and a four-digit year display, a signature of the Kurt Klaus calendar system. This specific reference is noted for its solid gold case construction and the mechanical complexity of housing 659 parts. On the secondary market, this model typically trades in the $60,000 to $95,000 range depending on service history and the presence of original accessories. A notable production detail is that the minute repeater slide is positioned on the left side of the case, activating two hammers that strike tuned gongs.