The Da Vinci Perpetual Calendar by IWC was first released in 1985 with the reference 3570. This was a groundbreaking moment for the brand, as it marked the introduction of their perpetual calendar mechanism for wristwatches. It was met with rave reviews and a high price tag that shook the industry. This mechanism became a staple in IWC's collection, appearing in models like the Novecento, GST, Pilot's Chronograph, and even in watches from sister brand JLC. The Da Vinci Perpetual 3750 comes in a 39mm polished Red Gold case and a Black dial with contrasting sub dials. It was also available in other metals and dial colors, with multilingual markings. The default