The perpetual calendar wristwatch is one of the most complex yet elegant complications in horology, and in 1985 IWC took it a step further when master watchmaker Kurt Klaus revolutionized the function. Instead of relying on multiple pushers and correctors, his ingenious system allowed all adjustments to be made simply through the crown—a remarkable feat of micro-engineering at a time when the computer itself was still in its infancy. The result was the launch of the Da Vinci Perpetual Calendar ref. 3750, an instantly successful creation that combined elegance with unprecedented practicality.

Powered by the self-winding cal. 79261, based on the reliable Valjoux 7750, the Da Vinci also incorporated a chronograph, making it one of the most versatile and accessibly priced perpetual calendars available at the time. Its distinctive case, inspired by Leonardo da Vinci’s fascination with recurring circles, gave the watch its name and enduring identity. The model was warmly embraced by collectors, ensuring its continued place in IWC’s catalogue to this day.

The present example, however, is far rarer. According to IWC archives, just one month after the launch, the brand quietly produced an ultra-exclusive edition of only 25 pieces in platinum. Never publicly announced, it is believed these watches were reserved for IWC’s most important clients. Sold in November 1985, this particular piece is preserved in very good condition—an exceptional opportunity to acquire one of the rarest iterations of the Da Vinci, and a discreet piece of IWC’s history.