Portugieser Perpetual Calendar

A moon you can rely on, even under cloudy skies: the perpetual calendar's high-precision moon phase display needs a one-day adjustment every 577.5 years.

Overview
Reference: IW503302
Dial Color: Silver
Case: 18 ct 5N gold
Strap: Dark brown alligator leather strap by Santoni
Diameter: 44.2 mm
Movement: Automatic, self-winding, IWC-manufactured movement

Features
Small hacking seconds
Pellaton automatic winding
Sapphire glass, arched-edge, antireflective coating on both sides
Power reserve display
7 days power reserve
Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase

Case
Strap width: 22 mm
Buckle width: 18 mm
Case: 18 ct 5N gold
Diameter: 44.2 mm
Height: 14.9 mm
Water Resistance: 3 Bar
Back case: With synthetic sapphire crystal

Movement
Caliber: 52611
Movement type: Automatic, self-winding
IWC-manufactured movement: Yes
Power Reserve: 168 hours
Frequency: 28800 Vph (4 Hz)
Components: 381
Jewels: 54