Very cool. What's the purpose of that civil defense marking?
From what I read in the owner's manual..
"In the event of a national emergency or enemy attack, all stations will go off the air and you are to tune your radio to one of the Civil Defense stations marked by the Conelrad markings.
They will give you information on what to do"
-1956 Ford Owner's Manual
I'm assuiming it has to do with Cold War stuff.....