In 1907 the company name changed to Waltham Watch Co. (WWCo), in 1923 briefly to the Waltham Watch and Clock Company and finally in 1925 to the Waltham Watch Company (WWC).
1917 erfolgt erneut eine Umfirmierung in „Waltham Watch Co.“ (WWCo), im Jahr 1923 dann in „Waltham Watch and Clock Company“ und schließlich 1925 in „Waltham Watch Company“ (WWC).