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I intend to spend about 2/3 years with the steel watch, do you recommend the black or traditional steel watch?

Stainless= Regular 316L stainless (Soft, dense metal that scuffs very easily, which Can be removed with a polishing cloth).

Black stainless= 316L stainless steel that has a DLC coating on the casing [Diamond Carbon coating] Which is extremely durable against scratches/scuffs, but they cannot be removed with a polishing cloth due to the DLC.
 
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