American Waltham Watch Company — Model 1857 Pocket Watch Movement

The Model 1857 (also referenced as the Model 57) is an 18-size, full-plate pocket watch movement manufactured by the Waltham Watch Company in Waltham, Massachusetts, an enterprise also known historically as the American Watch Company and the American Waltham Watch Company. Featuring a lever escapement and designed for key winding and key setting, the movement was introduced in 1857 as the first watch mechanism produced in quantity using interchangeable parts. This transition to standardised industrial manufacture significantly reduced the cost of both production and maintenance.

The movement's inception coincided with an ownership transition at the Waltham facility. Robbins. The company survived the financial downturn, and demand surged dramatically during the American Civil War. To supply soldiers seeking affordable personal timepieces, the firm introduced a grade named the "William Ellery". This variant became exceptionally popular with Union troops, accounting for 45 per cent of annual sales by the end of the war, and helped push company output above 50,000 timepieces annually by 1865.

Model 1857 movements were constructed with the grade name and serial number engraved directly onto the plate, with the jewel count and finishing varying according to the grade. Dials are typically white enamel bearing Roman or Arabic numerals. While complete watches were frequently fitted into cases made of coin silver—a 90 per cent pure alloy commonly used for coinage to withstand heavy use—cases and movements must be evaluated separately, as original cases were frequently replaced in later periods.