[IWC Watches] IWC International Pilot Series TW2 Watch TOPGUN Naval Air Combat Force Chronograph Watch Its product model is IW389001, and the inner ring is timed for 12 hours The outer ring is 60 minutes. The cumulative hours and minutes are displayed in a time-reading manner. There is a special time display window at 3 o'clock. The all-black round case is made of ceramic material.