The IWC Portugieser Perpetual Calendar (Reference IW502218) is a highly coveted luxury timepiece featuring a 42.3mm 18k white gold case, a striking Ardoise grey (slate) dial, and IWC’s iconic autonomous mechanical calendar system. Originally produced from the mid-2000s until around 2010, this specific reference belongs to the generation powered by the Pellaton-driven caliber 51610 movement, which boasts a remarkable 7-day (168-hour) power reserve.

  The defining feature of the IW502218 is its synchronization mechanism, originally engineered by master watchmaker Kurt Klaus. Unlike most perpetual calendars, all indicators are perfectly synchronized and can be advanced seamlessly via the crown alone.

• Moonphase: A high-precision display situated at 12 o’clock, accurate to one day every 122 years.

• Sub-dials:

  • • 3 o'clock: Date and power reserve indicator.

    • 6 o'clock: Month indicator.

    • 9 o'clock: Day of the week and small seconds.

• Year Window: A full 4-digit year indicator nestled between 7 and 8 o'clock.

• Case Material: 18k White Gold (42.3mm diameter, ~14mm thickness)

• Dial: Ardoise / Slate Grey with applied 18k white gold Arabic numerals

• Movement: IWC Manufacture Caliber 51610 (Automatic, 64 jewels, 21,600 vph)

• Power Reserve: 7 Days (displayed via sub-dial at 3 o'clock)

• Caseback: Exhibition sapphire crystal displaying the decorated rotor and movement