Sinn watch u1 leather u1 watches are certain to impress since submarine steel has been used in the production process adding to the resilience of the timepiece the movement is resistant to both shock and magnetic influences the bezel is scratch resistant because of the usage of sinns tegiment technology additional features include minute ratcheting on the bezel a date window at the 3 o clock mark crown at 4 o clock luminous hands and markers and scratch resistant sapphire crystal glass