The Portofino Chronograph 39 features the IWC-manufactured 69355 calibre and a sapphire glass back.

Overview
Reference: IW391503
Dial Color: White
Case: Stainless steel
Strap: Stainless steel bracelet
Diameter: 39 mm
Movement: Automatic, self-winding, IWC-manufactured movement

Features
Sapphire glass, convex, antireflective coating on both sides
Central hacking seconds
Chronograph function with hours, minutes and seconds

Case
Case: Stainless steel
Diameter: 39 mm
Height: 13 mm
Water Resistance: 5 Bar
Back case: With synthetic sapphire crystal

Movement
Calibre: 69355
Movement type: Automatic, self-winding
IWC-manufactured movement: Yes
Power Reserve: 46 hours
Frequency: 28800 Vph (4 Hz)
Components: 205
Jewels: 27
Decoration: Côtes de Genève, Perlage