Econolite Call Box

[squad546]

I've probably walked past this thing 100 times and never noticed it. At the Lexington fire training center there are different items in the lobby on display. Including this call box, and I don't think I've ever seen one before. It's a Econolite, division of Tamar Electronics. When you open it there is just a red button and a light to confirm it has been transmitted, looks like it's circa 1970s? Anyone see one of these before or know anything about them? Couldn't get a picture of the inside since the lid wouldn't stay open. Google wasn't much help.