Bremonts alt1 z watch is designed for aviators and world travellers the z in the name stands for zulu time the watch gives the wearer an option to display local time alongside an official world time standard the watch is equipped with be 54ae automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels a 42 hour power reserve is available for the convenience of the wearer other characteristics include glucydur balance anachron balance spring and nivaflex 1 mains