A technical outlier within the IWC GST line, this IW371513 brings split-seconds chronograph architecture to the brand's angular stainless steel sports case. The salmon dial softens the 42.9mm case with an unexpected warmth, while the steel bracelet keeps the watch firmly in the GST family's industrial register. Its automatic movement drives the chronograph along with a calendar and date. At 17mm thick, it wears with the purposeful stance this complication deserves.