Steel IWC Portuguese Automatic Ref: IW500109. 42mm case diameter. Pellaton automatic winding mechanism. IWC caliber 50010, Breguet spring, rotor with 18K yellow gold weight. Blackdial with Arabic numeral hour markers and track outer minute markers. Second sweep subsidiary dial and seven day power reserve indicator with date display at the 6 position. Black croc strap with steel folding clasp. Box and papers. Pre-owned UNUSED. Our reference W3138.