ZENITH El Primero big chronograph, Switzerland around 2002, self winding, reference 03.0520.4002, chronometer in stainless steel including original leather strap with butterfly buckle, on both sides sapphire- glazed, display of hours, minutes, constant second, date & chronograph, rhodium plated movement calibre 4002, 31 jewels, diameter approx. 44 mm, original box, blank warranty papers & chronometer certificate enclosed, condition 2