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I have a 564 with p.5000 that runs fast when fully wound for the first couple minutes. I’ve seen it described as “galloping”, which makes sense when you press your ear to the watch and listen. It makes a tickety-tock tickety-tock sound instead of the usual tick-tick-tick. During that time my watch might gain 10-20 seconds within a few minutes. After it finishes galloping, it runs about +2 to +5 spd for 9.5 days.
It’s a quirky movement but its behavior is predictable so I don’t mind.
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