IWC Portugieser Perpetual Calendar

In 18-carat yellow gold the Portugieser Perpetual Calendar is IWC's masterpiece presented without restraint. Kurt Klaus conceived the calendar module in the 1980s with an elegance that still astonishes: date, day, month, four-digit year and moon all advance from a single mechanical programme requiring no correction until 2100, set through the crown alone. The double moonphase deviates by one day in 577.5 years.

Reference: IW344202
Movement: Automatic, in-house calibre with Pellaton winding
Power reserve: approx. 168 hours (7 days)
Case: Rose Gold, 42.4 mm
Complications: Perpetual calendar, four-digit year, double moonphase
Year: 2026 — Full set