"Seconds" is a bit harsh, that's not what I said. But in every manufacturing process, there is some tolerance, so some of the finished pieces will always be closer to optimum spec than others. Which is part of why a chronometer may have to be adjusted in some positions, as opposed to merely passing/failing a test.
Your watch my keep time within +/- 2 seconds per day, mine may keep 3. Doesn't mean mine is a second, just that yours is closer to a perfect spec, or was adjusted more carefully. Or, that you swing your arm differently.(G)
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