possibly the most complicated IWC watch. 18-carat red gold case at 46mm. Mechanical Hand-wound movement with 2 barrels, Breguet spring, 96-hour power reserve. Constant-force tourbillon and small seconds at 9 o’clock. Sidereal time at 12 o’clock. On the BACK SIDE- Perpetual calendar with leap year display and absolute day of the year, Celestial chart showing horizon, ecliptic and celestial equator. Indication for day, night and twilight. Display for sunrise and sunset. Made to order configuration, limitless combinations. Price at approximately CHF750,000.00