The Pilot's Watch Perpetual Calendar Chronograph Edition "Le Petit Prince" is the first Pilot's Watch from IWC to combine the perpetual calendar and chronograph functions. The perpetual calendar designed in the early 1980s by Kurt Klaus comprises around 80 parts and independently recognizes the various lengths of the months and leap years. It will require no readjustment until 2100. The date, day, month, moon phase and year displays are perfectly synchronized with each other. If the watch has not been worn for some time, it can be reset merely by turning the crown. The IWC-manufactured 89630 calibre combines the perpetual calendar with a chronograph function. The calendar's moon phase display is integrated with the chronograph totalizer at "12 o'clock". This complicated Pilot's Watch is housed in an 18-carat 5N gold case. The special edition designed to honour "Le Petit Prince" features the typical midnight blue dial and is limited to just 250 watches.