IWC Portugieser Chronograph, reference IW371606.

This timepiece comes in 41 mm stainless steel, blue dial with rhodium-plated hands and Arabic numerals, on a black alligator leather strap with a comfortable butterfly folding clasp. Houses precision IWC in-house automatic movement calibre 69355, which holds a power reserve of up to 46 hours, and is visible through the transparent case back.