Sinn watch u2 s ezm 5 leather u2 is a professional diving watch one of its most distinctive features is the use of german submarine steel which is resistant to pressure magnetic influences and water penetration sinns special dehumidifying technology is used as well a date window is positioned at the 3 o clock mark additional functionalities include captive divers bezel with minute ratcheting crown at 4 o clock second time zone mission timer design luminous dial elements and scratc