The hamilton khaki field auto chrono is a very rugged and practical timepiece it is equipped with swiss made valjoux 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels a day and date display is positioned at the 3 oclock mark the chronograph of the timepiece comes with a 60 second a 30 minute and a 12 houre register hands and indices are luminous for improved night time visibility additional useful features include tachymeter scale minute markers ar