Power reserve

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Time that a watch runs correctly without external interference, such as manual winding or kinetic movement (in case of watches with automatic winding).

If a watch has a particularly high running time, the maximum possible power reserve is usually limited to the officially given period, in order to exclude a change in accuracy, when the tension of the mainspring tires, otherwise it could have run longer. Or the watch is equipped with a special regulation system, as with the Lange 31 or the DeWitt Academia Tourbillon Force Constante, by which the driving force of the mainspring is held continuously equal during the entire running time.

See also: