Chronograph

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Electa Pocket Chronograph (ca. 1890s) manufactured by the Gallet Watch Company in La Chaux-de-Fonds, Switzerland.

A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch. A basic chronograph has an independent sweep second hand; it can be started, stopped, and returned to zero by successive pressure on the stem. Nicolas Mathieu Rieussec invented the chronograph in 1821. Rieussec was awarded the original patent for his chronograph in 1822.

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