The hamilton khaki field officer mechanical is a resilient timepiece that manages to remain stylish at the same time it is equipped with swiss made eta 6497 hand wound calibre that performs 18 000 vibrations per hour and has 17 bearing jewels a 40 hour power reserve is available for the convenience of the wearer the timepiece comes with a 24 hour inner dial display and a seconds sub dial hands and hour markers are luminous for improved night time visibility additional useful features includ