This Time-O-Stat 8-Day Thermostat was manufactured by the Time-O-Stat Controls Corporation of Elkhart, Indiana around 1932. The home owner could program thermostat to keep different temperatures during the day or night, and the clock switched between these temperatures for 8 days before it needed to be wound. The thermostat’s temperature could be set between 60 and 80, and the thermometer on the front displays the temperature from 30 to 100 degrees, clock  is working