The Da Vinci Perpetual Calendar IW3750-28 boasts a sleek Stainless Steel case and a Black dial. IWC made waves in 1985 with the introduction of their perpetual calendar mechanism in the Da Vinci reference 3570. This innovative feature continued to impress and was used in various models, including the Novecento, GST, and Pilot’s Chronograph, as well as in watches by JLC. It even served as the foundation for IWC's Grande Complication and the breathtaking Destriero Scafusia. With a 39mm diameter and 14.3mm thickness, the watch also features hinged lugs and was available in different metals and dial colors. The default option was plexiglass