My experience with those kind of Seiko movements suggests they run fast if left dial up and slower if left crown up.
Yes, mine gains at least 10s overnight regardless of the position. About 14s dial up, about 10s crown up. I wonder if this is something they do on purpose...
@PawG started
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My experience with those kind of Seiko movements suggests they run fast if left dial up and slower if left crown up.