You do not strictly need a watch winder for your automatic watch if you wear it regularly, as the natural motion of your wrist will keep it wound. However, a watch winder can be very useful if you:
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Alternate between multiple automatic watches and do not wear them all daily.
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Want to keep your watch running continuously without stopping.
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Own a watch with complex features (like perpetual calendars, moon phases, or multiple time zones) that are tedious to reset every time the watch stops.
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Wish to maintain the lubrication inside the movement, as continuous mild motion prevents lubricants from drying out or becoming congealed, which can damage the watch over time.
A watch winder mimics wrist movement by slowly rotating the watch, thus keeping the mainspring wound and the watch ready to wear at any time. While not an absolute necessity, it can extend the life of your watch, maintain time accuracy, protect against damage, and save you the hassle of resetting your watch.
In summary, if you wear your automatic watch daily, a winder is not essential. But if you don’t wear it frequently or have multiple automatic watches, a watch winder is a practical accessory to consider.