Sinns 303 silver 12 chronograph has received its name because of the 12 hour rotating bezel that allows for specific time measurements the watch comes equipped with valjoux 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels additional features include silver electroplated uv resistant dial pressure resistance a day and date window at the 3 oclock mark and scratch resistant sapphire crystal glass with anti reflective coating