IWC. Curated. Da Vinci Perpetual Calendar: Kurt Klaus' Single Crown Invention, accurate to 2499.

IWC pioneered the first perpetual calendar in 1985 that could be fully adjusted via a single crown, without the need for any tools or instruments, setting a new benchmark in watchmaking. What makes the Da Vinci Perpetual Calendar so revolutionary? Kurt Klaus' ingenious design achieved unparalleled ease of use. With just 81 components, all its intricate functions - from date to moon phase - are fully synchronized and effortlessly set via a single crown. No correction needed until the year 2499. IWC Museum Curator David Seyffer and Sales Manager Jule Schäfer, who lead the IWC. Curated. program, explore the world of pre-owned, certified IWC timepieces.