Assertion: diver's system | /r/Synonym | safedive
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text: In 2014, IWC went all the way and seems now to be offering, for the first time, the best of both worlds: The current IWC Aquatimer family features a system, called Safedive, that combines a unidirectional internal bezel that can only be rotated with a ratcheting external bezel (which can be moved in both directions, but only counter-clockwise for adjusting the internal bezel).