IW5041-01Ref

The Portuguese Sidérale Scafusia stands as IWC's most complex and exclusive mechanical timepiece, requiring a decade of development. The front displays a constant-force tourbillon, power reserve, and sidereal time, while the case back features a custom-calculated astrolabe showing over 500 stars, sunrise/sunset times, and a perpetual calendar. Due to its intricate nature and over 200 possible configurations, production is strictly limited to a few pieces annually.