In 1985, IWC made waves in the watch industry with the release of their Da Vinci Perpetual Calendar reference 3570. This groundbreaking timepiece featured a perpetual calendar mechanism and was met with critical acclaim and a high price tag. This mechanism became a staple in IWC watches, including the Novecento, GST, Pilot's Chronograph, and even models from JLC. It also served as the foundation for the impressive Grande Complication and the Destriero Scafusia. The case of the Da Vinci Perpetual 3750 measured 39mm by 14.3mm and came in various metals and dial colors. Plexiglass was the standard option, but a sapphire crystal could be