Size Mens Case Material Stainless Steel Dial Color Ruthenium Bracelet/Strap Alligator/Crocodile Leather Brown Clasp Type Deployant Clasp Movement Automatic Chronograph Screw Down Crown No Bezel Uni-Directional Rotating Crystal Scratch Resistant Sapphire Case Back Solid Water Resistant 100m/330ft. Case Diameter 42.5mm Case Thickness 15.4mm Warranty All papers included Breguet 3810st/92/9zu Complete Details: NEW The new Type XXI (21). Features an Automatic Movement with a Flyback Chronograph Function (allows instant restarting of the chronograph with a single push of the button instead of the need to stop & then reset the stop-watch). This watch also features large minute counter rather than the tradional sub-dial, in its place (at the 3 o'clock position) is a 24 hour sub-dial to differentiate between AM & PM. Luminous Hands & Arabic Numeral Hour Markers, Date Window Displayed at the 6 o'clock position . 48 Hour Power Reserve. Featured Complications: Chronograph This watch is also known as 3810st929zu