In 1985, IWC debuted their revolutionary perpetual calendar mechanism in the Da Vinci reference 3570, making waves in the watch industry. It quickly became the go-to mechanism for not just the Da Vinci collection, but also other IWC and JLC models. This same mechanism served as the foundation for the brand's impressive Grande Complication and the stunning Destriero Scafusia. The Da Vinci Perpetual 3750 comes in a 39mm polished Red Gold case with a Black dial and contrasting sub dials. It was also available in various metals and dial colors, with the option for plexi glass or sapphire crystal. In 1987, a ceramic case option was introduced as the 3755