The precision of each movement – formally certified for a chronometer because of the Swiss Official Chronometer Testing Institute (COSC) – is examined a second time by Rolex right after staying cased, to ensure that it satisfies requirements which have been significantly stricter than those in the Formal certification. https://directorydepo.com/listings660354/top-guidelines-of-where-to-find-watch-collecting-resources-for-specific-budgets