"The Waltham Watch Company, also known as the American Waltham Watch Co. and the American Watch Co., produced about 40 million watches, clocks, speedometers, compasses, time ...
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fuses, and other precision instruments between 1850 and 1957. The company´s historic 19th-century manufacturing facilities in Waltham, Massachusetts have been preserved as the American Waltham Watch Company Historic District." - (en.wikipedia.org 30.05.2020)