You should avoid quick-setting the date on a mechanical watch during the sensitive nighttime danger zone, which typically spans from 9:00 PM to 3:00 AM on most traditional watch movements. During this specific multi-hour window, the internal mechanical gears, levers, and date-changing mechanism are actively engaged in the process of automatically advancing the calendar wheel. Operating the quick-set crown or manually pushing the date forward while the gear teeth are interlocked can place immense stress on the delicate components, resulting in stripped gear teeth, jammed date discs, and expensive internal repair bills.
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