On one of my antique store expeditions I found this unused, complete counter display. Did anyone ever use this back in the day, did it work? As evidenced by the box it makes some pretty big claims.
https://www.flickr.com/photos/advance-design_parts_co/19901696303/in/album-72157631872034068/
https://www.flickr.com/photos/advance-design_parts_co/20528983731/in/album-72157631872034068/