An American Waltham Regulator wall clock with a key. Tall wooden opening case and a white painted with blue flowers dial marked: Waltham. Dated from the middle of the 20th century. Labeled Made in Korea on the backside. The Waltham Watch Company, also known as the American Waltham Watch Co. and the American Watch Co., was a company that produced about 40 million watches, clocks, speedometers, compasses, time delay fuses, and other precision instruments in the United States of America 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. Collectible American Desk Clock For Cabinet And Home Library Decor.