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Every watch movement was engraved with an individual serial number which can be used to estimate the date of production. Volunteers have created a database of Waltham serial numbers, models and grades, and descriptions of observed watches. This watch is dated between 02/01/1870 and 03/01/1871.
The Waltham Watch Company, also known as the American Waltham Watch Co. and the American Watch Co., produced about 40 million high quality watches, clocks, speedometers, compasses, time fuses and other precision instruments between 1850 and 1957. The company's historic manufacturing facilities in Waltham, Massachusetts have been preserved as the American Waltham Watch Company Historic District.