Audemars Piguet Calibre 4401 automatic chronograph movement, blue dial with silver-tone hands and index markers, fixed white gold bezel, transparent sapphire case back, three sub-dials for seconds, minutes, and hours (including a column wheel mechanism), date display at the 4-5 o'clock position, round 41 mm case size, black rubber strap with buckle clasp, water resistance up to 30 meters or 100 feet.