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Automatic watch. An automatic or self-winding watch is a mechanical watch in which the mainspring is wound automatically as a result of the natural motion of the wearer to provide energy to run the watch, making manual winding unnecessary. A mechanical watch which is neither self-winding nor electrically driven is called a manual watch. Most mechanical watches manufactured today are self-winding.
The Hamilton 992B Railroad Pocket Watch, Hamilton Railway Special. The Hamilton grade 992B is a high quality antique mechanical pocket watch. A well maintained and adjusted watch kept in a fixed location at room temperature can reach accuracies normally only seen with quartz watches.