IWC: Da Vinci/1985
The Da Vinci watch with the perpetual calendar made by IWC was a stroke of genius in the long history of the mechanical watch. In 1985, it marked the start of a new era for perpetual calendars in wristwatch format. The "time machine" from Schaffhausen, named after the Italian inventor, artist and genius Leonardo Da Vinci, boasts a unique mechanism.
Its Perpetual Calendar is mechanically programmed until the year 2500, knows evers leap year by heart and requires no adjustment other than the replacement of the century slide supplied with the watch. Only the years 2100, 2200 and 2300 need a minor correction to be made, because these are not leap years according to the Gregorian calendar.