The IWC Portofino Chronograph (Ref. IW391009) is a luxury Swiss dress watch that balances understated elegance with practical stopwatch functionality. Drawing design cues from vintage pocket watches, this model features a 42mm stainless steel case, an analog silver-plated dial, and a signature stainless steel Milanaise mesh bracelet.

• Day-Date Window: Located cleanly at the 3 o’clock position for enhanced calendar functionality.

• Chronograph Sub-dials: Vertically arranged sub-dials at 12 o’clock (12-hour counter) and 6 o’clock (30-minute counter) balance the layout.

• Running Seconds: A minimized constant running seconds counter resides at the 9 o'clock marker.

• Elegant Markers: Slim baton indices coupled with stylized Roman numerals at 6 and 12 o’clock maintain the classic dress DNA.

• Vintage Profile: Features straight, mirror-polished lugs and mushroom-shaped pump chronograph pushers.

• Wearability: A curved ergonomic profile slips easily beneath formal shirt cuffs.

• Calibre 75320: An IWC-modified 25-jewel mechanical movement that runs at 28,800 vibrations per hour. It features efficient unidirectional winding and a hacking seconds function for precision synchronization.

• Crystal: Fitted with a scratch-resistant domed sapphire crystal protecting the face.