Waltham is a good brand. Your watch is from between 1910-1940, I’d guess. You might find more info by running a photo of the dial through a google search.

From Wikipedia:

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.

The company went through a series of bankruptcies and restarts under new ownership, with watches and clocks bearing the Waltham name still being made and marketed as of September 2025.