In 1985, IWC debuted the Da Vinci reference 3570, which was the first wristwatch to feature their impressive perpetual calendar mechanism. This groundbreaking innovation quickly gained recognition and was used in various IWC and JLC watches, including the Novecento, GST, and the Pilot's Chronograph. It even served as the foundation for the Grande Complication and the Destriero Scafusia. The Da Vinci Perpetual 3750 came in a 39mm x 14.3mm case with hinged lugs and was available in different metals and dial colors. The default option was plexiglass, but sapphire crystal could be requested. In 1987, a ceramic case version was