A moon you can rely on, even under cloudy skies: the perpetual calendar's high-precision moon phase display needs a one-day adjustment every 577.5 years.

The moon phase display on the Portugieser Perpetual Calendar diverges by just 1 day in 577.5 years from the actual phase of the moon. The elegant timepiece leaves virtually no wish unfulfilled. It is equipped with features such as a perpetual calendar, a window showing the year in four digits and a 7-day automatic movement with Pellaton winding. The four subdials on the silver-plated dial display the phase of the moon, the date, month and day, the power reserve and the small seconds.

CASE

• 18 ct 5N gold case
  
• Diameter 44.2 mm
  
• Height 14.9 mm
  
• See-through sapphire glass back
  
• Water resistance 3 bar

MOVEMENT

• 52610 Calibre
  
• Automatic, self-winding
  
• 168 hours Power Reserve
  
• 28800.0 (4.0 hz)
  
• 374
  
• 54 Jewels

FEATURES

• Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase
  
• 7 days power reserve
  
• Power reserve display
  
• Sapphire glass, arched-edge, antireflective coating on both sides
  
• Pellaton automatic winding
  
• Small hacking seconds

WARRANTY

IWC provides a standard 2-year International Limited Warranty and extension of an additional 6-year coverage by registering your watch through 'My IWC' after your purchase, totaling to 8 years.