Mine has gained six seconds in seven days. It was keeping time to 2 seconds a day, but after about six weeks it settled down more. But the real test will be how the GMT performs over 4, 5, 6 years. For mine Steve, best timekeeping is when I wear it 24 hours a day, or when I place it crown up at night. My Submariner keeps time to 3 seconds a day - still very respectable.
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