Portugieser Perpetual Calendar


IWC, Portugieser Perpetual Calendar



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SKU: IW503301 Categories: , , ,


IWC’s Portugieser Perpetual Calendar has a 44.2mm 18ct white gold case housing their own automatic self-winding in house movement, 52610 Calibre. 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 sub-dials on the slate-coloured dial display the phase of the moon, the date, month and day, the power reserve and the small seconds.

In watchmaking, “perpetual calendar” describes a calendar mechanism that correctly displays the date on the watch ‘perpetually’, taking into account the different lengths of the months as well as leap years.

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. Some versions of the calendar feature a double moon phase display, showing the moon phase on the northern and southern hemispheres.

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