B 42 black chronograph features stylish all black design and all of the functionalities that a timepiece for professionals and active individuals should come with it is equipped with swiss made valjoux 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels other movement characteristics include fine timing device and incabloc shock absorber hands numerals indices and bezel elements are covered with luminous paint that enhances night time readability a day