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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.
ABOUT THE WATCH
Portugieser Perpetual Calendar
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. This timepiece is powered by an IWC-manufactured movement from the 52000-calibre family, featuring a solid 5N gold rotor and blued screws. The 18-carat 5N gold watch has an arched-edge front glass and comes with a dark brown alligator leather strap.
Perpetual calendar | IWC Schaffhausen
In the early 1980s, IWC’s head-watchmaker Kurt Klaus set out on an engineering journey to translate the Gregorian calendar with its many irregularities into a mechanical program for a wristwatch. His ingenious perpetual calendar, which debuted in the Da Vinci Perpetual Calendar in 1985, comprises only about 80 parts and displays the date, day, month, year in four digits, and the moon phase. The smart mechanical program automatically recognises the different length of the months, and even adds a leap day at the end of February every four years. The moon phase display is so precise that it will deviate from the actual phase of the moon by just one day after 577.5 years. All displays are perfectly synchronised and can be adjusted simply by turning the crown. Some models come with an additional century slide, so the watch can continue showing the date until 2499. The calendar only needs a small adjustment in those centurial years that skip the leap year, which is the case in 2100, 2200, and 2300. Some versions of the calendar feature a double moon phase display, showing the moon phase on the northern and southern hemispheres.
Features
Case
Movement
Packaging
Small hacking seconds
Pellaton automatic winding
Sapphire glass, arched-edge, antireflective coating on both sides
Power reserve display
Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase
7 days power reserve
Case
18 ct 5N gold
Diameter
44.2
mm
Height
14.9
mm
Back case
See-through sapphire glass back
Water resistance
3.0
bar
Calibre
52611
Movement type
Automatic winding,
IWC-manufactured movement
