As I recall, DLC was the 'thinnest' of the coatings... I only remember bits of what I had read before when I had sent a few knives I had owned to get coated with a group of other people. DLC coatings are popular with the tactical knife collector crowd.
As for a watch, I would think that the procedure must be more careful since you have to remove the movemnt and send the case in to be done separately. I don't know what the challenges and issues are with this type of work, but I know there are a bunch of guys that have done this... maybe Paneristi or Watchuseek has some guys familiar with this type of work?
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