IW503302
Portugieser Perpetual Calendar
Automatic winding, Diameter 44.2 mm
PRODUCT INFORMATION
- Silver dial
- Dark brown alligator leather strap by Santoni
- Strap width 22.0 mm
Portugieser Perpetual Calendar
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.
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
- 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
- Power Reserve 168 hours
- Frequency 28'800 VPH (4 Hz)
- Components 381
- Jewels 54
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