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About the accuracy of the watch - Blog Profile - My Community /about-the-accuracy-of-the-watch About the accuracy of the watc When we talk about the accuracy of the course, we mean a certain permissible error of deviation from the reference time. Mechanical watches are characterized by a deviation within -40 / + 60 seconds per day, for quartz watches - +/- 20 seconds per month. Some models are equipped with a chronometer, which makes them particularly accurate. Mechanical ones equipped with it can deviate by only -4 / + 6 seconds per day, and quartz ones by +/- 5 seconds per year.