IWC Schaffhausen Portofino Chronograph

The IWC Schaffhausen Portofino Chronograph IW391031 is a steel chronograph with a 42 mm case. It measures 13.6 mm thick, and the case is finished in stainless steel. The case carries a 30 metre water resistance rating. Inside is the self-winding calibre 79320, giving 44 hours of power reserve. The dial sits under a convex sapphire crystal with antireflective coating on both sides. Beyond the chronograph function, the watch shows the date and weekday alongside small seconds. It comes fitted with a black alligator leather strap measuring 20 mm at the lugs.