This special edition of the Portugieser Perpetual Calendar captivates with a nautical design in dark blue and gold.
ABOUT THE WATCH
Portugieser Perpetual Calendar
IWC’s perpetual calendar, developed by Kurt Klaus in the 1980s, automatically recognizes the different lengths of the months and the leap years. It can be easily adjusted using the crown. The mechanical program will not require any manual correction until 2100. The Portugieser Perpetual Calendar displays the calendar information on four sub-dials. In addition to the displays for the date, the weekday, the month and the moon phase, it features a four-digit year indication and a power reserve display. This special edition is characterized by a maritime design and is available exclusively at IWC boutiques and online at iwc.com. It features an 18-carat Armor Gold® case, a blue dial, gold-plated hands and 18-carat gold appliqués. The IWC-manufactured 52610 calibre’s Pellaton winding system is fitted with ceramic components and builds up a power reserve of 7 days in two barrels. The decorated movement and the rotor in 18-carat gold are visible through the sapphire glass case back.
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
Rotor in 18-carat 5N gold
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 Armor 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
