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. The investors in the company had formed The Waltham Improvement Company to purchase the land and buildings in Waltham to manufacture the watches. The company, known in 1854 as The Boston Watch Company, moved to Waltham, Massachusetts in 1854.

Picture of the Ellery Model 1857, produced when Waltham was still named Boston Watch Company. The company also became known as The Boston Watch Company starting in 1853. Bartlett' watch, named for early employee Patten Sargent Bartlett. January 1853 saw the introduction of the 'P.S. A few, marked 'Fellows & Schell', sold for $40. Numbers 18 to 100 were named 'Warren, Boston' and the following 800 'Samuel Curtis', after the financial backer of the company. Number 1, given to Howard, is now at the Smithsonian Institution. The first 17 watches, which ran for 8 days, and were marked 'Howard, Davis & Dennison', were distributed among company officials. The company name was changed to Warren Manufacturing Company and released its first watch on the market in 1853. The company was originally named the American Horological Company and was made up of Dennison, Howard, Davis, and Samuel Curtis. The first prototype watch was completed in 1850. A year later, the company moved to its own factory in Roxbury, Massachusetts, employing both Swiss and English watchmakers. Dennison began to make watch parts for the company in its 'Howard & Davis' factory in 1849.

Initial funding of $20,000 came from venture capitalist as well as T.P.

Howard wanted Dennison to build locomotives but instead went into business with Dennison to make watches. In 1849, Dennison was approached by Edward Howard, a clock and scale maker from Boston. This was to reduce the expense of repairing watches. Dennison had the idea to make watches using machinery utilizing interchangeable parts.

He also created the Dennison Gauge which became the 'US Standard' gauge used to accurately measure different parts of watches. He also studied under Tubal Hone, considered the best watchmaker in America at the time. In 1833 he became a journeyman watchmaker with Currier & Trott in Boston, Massachusetts, leaving in 1839 to go into business for himself. The idea for the Waltham Watch Company came from watchmaker Aaron Lufkin Dennison. Aaron Lufkin Dennison, founder of the Waltham Watch Company.

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