The Portofino Automatic Moon Phase 37 features the IWC-manufactured 32800 caliber and a see-through sapphire glass back displaying the movement.

Overview
Reference: IW659602
Dial Color: Silver plated
Case: 18 ct 5N gold
Strap: Taupe calfskin strap with quick-change system
Diameter: 37.1 mm
Movement: Automatic, self-winding, IWC-manufactured movement

Features
Sapphire glass, convex, antireflective coating on both sides
Central hacking seconds
IWC bracelet quick-change system
Moon phase display

Case
Strap width: 18 mm
Buckle width: 16 mm
Case: 18 ct 5N gold
Diameter: 37.1 mm
Height: 11.3 mm
Water Resistance: 5 Bar
Back case: With synthetic sapphire crystal

Movement
Calibre: 32800
Movement type: Automatic, self-winding
IWC-manufactured movement: Yes
Power Reserve: 120 hours
Frequency: 28800 Vph (4 Hz)
Components: 187
Jewels: 21
Decoration: Côtes de Genève, Perlage