Back in the day kitchen clocks were the heart of the household. They kept the time and served as an alarm/timer. The middle dial can be set to trigger a separate ringer. Mom used it to time meal preparation. Many times the separate alarm has been disabled because the alarm cannot be stopped until the ringer's spring ran down. BUT this one in completely intact.
Can be seen at Yesterday's Antiques, 406 North Main, Broken Arrow, OK 74012