Steel IWC Portuguese Chrono Automatic IW3714-17. Automatic chronograph movement, water resistant to 30 meters. Case diameter 40.9mm x 12.3mm31 jewels, 44-hour power reserve. Silver Opaline dial with blue coloured numeral hour markers, outer minute markers, second sweep sub-dial hand, and leaf-shaped hands, blued steel 30-minute sub-dial hand and centre second hand. Black croc strap with steel buckle. Box and papers dated May 2010. Our reference S18014.