IWC Grande Complication

About this reference

The IWC Grande Complication reference 3770 in platinum was produced between 1990 and approximately 2005. This reference is significant for being the first wristwatch to integrate a perpetual calendar, chronograph, and minute repeater into a single movement, the caliber 79091. Based on a Valjoux 7750 architecture, the movement features a Kurt Klaus-designed calendar module that is synchronized via the crown. The platinum case measures 42.2mm in diameter and houses a solid silver dial with four sub-dials and a moon phase indicator. Production was limited to 50 pieces per year, contributing to its scarcity. On the secondary market, the reference 3770 in platinum typically trades between $80,000 and $120,000 depending on condition and provenance. A notable production detail is the inclusion of a slide on the left case flank to activate the minute repeater, which utilizes two gongs to chime hours, quarters, and minutes.