IWIW504101-Portugieser Sidérale Scafusia


Portugieser Sidérale Scafusia Add to my wishlist

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Case material, movement type, diameter mm

Made in Schaffhausen, Switzerland

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IW504101 Specifications



  • 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 dial



  • Black alligator leather strap
  • Strap width 22 mm

The Portugieser Sidérale Scafusia Story

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.

Calibre Family 94000

The hand-wound movement features two barrels, which provide the energy for a number of different complications, including the constant-force tourbillon, the astronomical module in the Portugieser Sidérale Scafusia and the digital Pallweber display.

Constant-force tourbillon

With the patented constant-force tourbillon, IWC elegantly combines two complications that serve to increase timekeeping precision. It ensures an extremely regular and precise rate over a period of at least 48 hours.

Perpetual calendar

The perpetual calendar is one of the most fascinating haute horlogerie complications. Originally developed by former chief designer Kurt Klaus and continuously improved since then, it is mechanically programmed for 577 years.

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