Sinn duo chronograph 756 utc aligator with folding clasp sinn 756 watches are designed to function impeccably in even the toughest of conditions this timepiece is equipped with valjoux 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels extreme protection from magnetic influences is one of the watchs most prominent characteristics sinns ar dehumidifying technology is used as well the timepiece comes equipped with various functionalities like a second