IWC Schaffhausen’s perpetual calendar was originally developed during the 1980s by former head-watchmaker Kurt Klaus. In 2003, the legendary complication was presented in the Portugieser collection for the first time. Since then, the Portugieser Perpetual Calendar has been a major pillar of the collection.

Overview
Reference: IW503704
Dial Color: Dune
Case: 18 ct white gold
Strap: Black alligator leather strap by Santoni View all compatible straps
Diameter: 44.4 mm
Movement: Automatic, self-winding, IWC-manufactured movement

Features
Small hacking seconds
Pellaton automatic winding
Power reserve display
7 days power reserve
Perpetual calendar with displays for the date, day, month, year in four digits and perpetual moon phase
Rotor in 18-carat 5N gold
Double box-glass sapphire crystals, antireflective coating on both sides

Case
Strap width: 22 mm
Buckle width: 18 mm
Case: 18 ct white gold
Diameter: 44.4 mm
Height: 15 mm
Water Resistance: 5 Bar
Back case: With synthetic sapphire crystal

Movement
Caliber: 52616
Movement type: Automatic, self-winding
IWC-manufactured movement: Yes
Power Reserve: 168 hours
Frequency: 28800 Vph (4 Hz)
Components: 385
Jewels: 54