(54594) IWC 3756 GST Perpetual Calendar Chronograph, 375615, IW375615, 3756-15, stainless steel on a stainless steel bracelet, automatic, Kurt Klaus perpetual calendar caliber, day, date, month, moon phase, four digit year indicator, all calendar functions are set/advanced using the crown only, chronograph, silver dial with applied silver indexes, luminous hands, water resistant to 120 meters, sapphire crystal, diameter: 43mm, thic...