Maybe the DK series is submarine steel because its also 200m water resistance like the divers. I have A DS30 and a DA46 both on bracelets. Even though the DS30 bracelet is submarine steel it looks like the clasp is ice hardened. You can tell the difference.I wonder why though. I understand the logic of making the divers watches out of submarine steel, but why make the DK series out of it, whilst the DC7* are made using instrument steel? Unless it's down to magnetism and the DC7*'s has to make use of a faraday cage like the ice hardened watches. Also they are going to have to make 3 different bracelets to ensure the colour match.
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