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I scratched up my Citizen Skyhawk professional the other day to prove that it is 99.999 percent scratch-proof to just about everything except for a diamond of course. DLC stands for diamond like carbon. So here are the photos of my keyed watch. Don't try this on non-DLC watches!
The keys are bronze and steel.
My DLC collection
From wikipedia: The hardest, strongest, and slickest is such a mixture, known as tetrahedral amorphous carbon, or ta-C. For example a coating of only 2μm thickness of ta-C increases the resistance of common (ie. type 304) stainless steel against abrasive wear; changing its lifetime in such service from one week to 85 years.
The link: http://en.wikipedia.org/wiki/Diamond-like_carbon
The keys are bronze and steel.






My DLC collection


From wikipedia: The hardest, strongest, and slickest is such a mixture, known as tetrahedral amorphous carbon, or ta-C. For example a coating of only 2μm thickness of ta-C increases the resistance of common (ie. type 304) stainless steel against abrasive wear; changing its lifetime in such service from one week to 85 years.
The link: http://en.wikipedia.org/wiki/Diamond-like_carbon