The speed of the mechanical watch is controlled by the gossamer and the balance, the magnetic force makes the swing frequency change, so the speed of the gear system changes, and the mechanical watch goes berserk.
After magnetic, the mechanical table may stop, slow, or fast; the symptom is light, the daily error is several 10 seconds; severe, the daily error reaches several points, the mechanical table is magnetized, its magnetism does not retreat, need to make degaussing repair to return to normal.
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