Sinns 142 st ii watch is unique this is the first automatic chronograph to be used during an outer space mission this durable and very functional watch is equipped with dubois dpraz automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels it is both high and low pressure resistant various useful functionalities have been added including a 60 minute stopwatch hand date 24 hour time display hand date interior pilots bezel transparent case back and scratch r