Leaving a Rolex unworn for an extended period is not structurally harmful, but it does cause the internal self-winding mechanical movement to eventually wind down and stop as the power reserve depletes. When the mainspring fully unwinds and sits stationary for months or years, the specialized lubricating oils inside the movement can slowly settle, thicken, or pool in one area, potentially leading to sluggish performance when restarted. To keep the mechanical oils evenly distributed and the calendar and time complications accurate, many collectors periodically wind their watches manually or store them in motorized watch winders.
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