IWC Schaffhausen Portugieser Chronograph

The IWC Schaffhausen Portugieser Chronograph IW371609 is a chronograph in a steel case measuring 41 mm across. The case is 13 mm thick and carries a 30 metre water resistance rating. The black dial sits under a convex sapphire crystal with antireflective coating on both sides. Inside is the automatic calibre 69355, self-winding, with a power reserve of 46 hours. Beyond the chronograph function, the dial carries a small seconds display. The case has a display back, so the movement is visible through the rear of the watch. It comes fitted with a black alligator leather strap at a 20 mm lug width.