IWC Portugieser Perpetual Calendar

In 18-carat white gold the Portugieser Perpetual Calendar is IWC's masterpiece at its most discreet — precious metal that reads as steel until it catches the light. 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.

Reference: IW503704
Movement: Automatic, in-house calibre 52610 with Pellaton winding
Power reserve: approx. 168 hours (7 days)
Case: White Gold, 44.4 mm
Complications: Perpetual calendar, four-digit year, double moonphase
Year: 2026 — Full set