The design of sinn 103 watches was made to resemble the cockpit instruments that pilots use this timepiece is equipped with valjoux 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels a special dehumidifying capsule is available to increase readability and to protect the mechanism additional functionalities include a date window at the 3 oclock mark second time zone on a 12 hour basis captive pilots bezel with minute ratcheting case made of titanium