What is a Chronometer? Our Guide to the World of Ultra-Precise Watches

When a watch touts on its dial that it is a "Chronometer" or an "Officially Certified Chronometer" or even a "Superlative Chronometer," what exactly does that mean? How does a chronometer watch differ from a watch that does not make that claim? For that matter, a newbie to the timepiece game might ask, what is the diff

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