In 1985, IWC launched the Da Vinci reference 3570, which introduced their first perpetual calendar mechanism for wristwatches. This was a groundbreaking development that received much praise and caused quite a stir in the industry due to its price. It quickly became the most popular perpetual calendar mechanism, not just in the Da Vinci collection but also in other IWC models and even in watches from other brands like JLC. This mechanism even served as the foundation for IWC's Grande Complication and the stunning Destriero Scafusia. The Da Vinci Perpetual 3750 came in a 39mm Red Gold case with a White dial, and the option for different dial colors and languages. A plexi glass was