The dial, in the style of a classic Portugieser, features a constant-force tourbillon together with displays for the 96-hour power reserve and sidereal time, which, among other things, is needed to find the same star each night in the same position. The reverse side is a fabulous astronomical module calculated precisely to reflect the owner’s wishes. From a previously defined location, the rotating night-sky disc shows more than 500 stars and constellations with such detail and precision that it would quicken the pulse of any astronomer. Making the necessary allowances for summer time and winter time, the watch also displays the times of sunrise and sunset, sidereal time and a perpetual calendar with the leap years. In view of the enormous amount of work involved and the more than 200 individual configurations possible, only a few watches are produced each year.
Platinum case Diameter 46.0 mm Height 17.6 mm See-through sapphire glass back Water resistance 3 bar
94900 Calibre IWC-manufactured movement Manual-winding 96 hours Power Reserve Frequency 18000.0 vph (2.5 hz) 56 Jewels Sandblasted, rhodium-plated
Tourbillon with integrated constant-force mechanism Perpetual Calendar with leap year display and absolute day of the year Power reserve display Celestial chart showing horizon Customized celestial chart Sunrise and sunset together with displays for day, night and twilight Ecliptic and celestial equator Sidereal time Sapphire glass, convex, antireflective coating on both sides
Black alligator leather strap Strap width 22 mm