These electrical panels are thought to be oriiginal to the house, which was built in 1946 in Fort Worth, Texas.  The big circuit breaker in the top panel allowed the user to cut off power to the circuit breakers in the bottom panel.
<a href="//commons.wikimedia.org/wiki/User:Circacies" title="User:Circacies">Circacies</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>