A mechanical watch has a spiral line. When people to watch winders, the spiral also was tightened. When the screw thread is loosened, it begins to drive the core to move. A major drawback of mechanical watches is the spiral line movement speed is inconsistent, which led to a decline in the accuracy of the time. Accuracy is also affected by wear and other factors such as temperature, location, parts. Therefore, when a piece of mechanical watches in the day with 15-30 seconds of error, can be regarded as normal. The minimum error can be achieved only 4-5 seconds.
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