The company, known in 1854 as The Boston Watch Company, moved to Waltham, Massachusetts in 1854. The investors in the company had formed The Waltham Improvement Company to purchase the land and buildings in Waltham to manufacture the watches. In 1854 it produced five watches per day and employed 90 people, and was the first factory in the world to produce a pocket ready watch in the same factory. Growth of the company prompted a significant expansion of these premises, whose surviving elements now date to the period 1879–1913. Now repurposed to residential and commercial use, the complex was listed on the National Register of Historic Places in 1989.