Khaki officer auto chrono by hamilton is a very resilient timepiece that also brags stylish design the watch is equipped with swiss made valjoux 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels the chronograph of the timepiece is equipped with a 60 second a 30 minute and a 12 hour register a day and date display is positioned at the 3 oclock mark hands are luminous for improved night time visibility additional useful features include minute markers