One thing that most mechanical wristwatches don’t keep track of is leap years, where an extra day is added to February. To correctly show February’s leap day, you would need a perpetual calendar complication in your watch, which is comparatively much more complicated, and much more expensive than a normal calendar complication. But here, you’ll see the Hoptroff watch, which is specifically designed to keep track of leap seconds, and is the first one ever made to do so.
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Introducing The First Watches To Account For Leap Seconds, From Hoptroff London