The Da Vinci Perpetual Calendar IW3750-35 boasts a sleek Stainless Steel case and a Black dial. IWC first introduced this impressive perpetual calendar mechanism for wristwatches in 1985 with the Da Vinci reference 3570, causing quite a stir in the industry. The module went on to become the most popular choice for not just the Da Vinci collection, but also for other IWC models like the Novecento, GST, Pilot's Chronograph, and even some from JLC. This same mechanism was also used in the IWC Grande Complication and the stunning Destriero Scafusia. The Da Vinci Perpetual 3750 came in a 39 * 14.3mm case with