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you need to remember that its also an average when fully wound across multiple positions (Face up/down, crown up/down, etc.) so depending on how you wear it, how often you wind it, how often you move to let the automatic works wind it, how you store it, your timekeeping will vary.
you could be 0 s/d in one position, and +5 or -5 s/d in another. If your watch isnt COSC certified, you can be even further out across positions.
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