The words "road runner" in lower case and the font used on the coasters is what was used on the 1st gen Plymouth road runner which was made from 1968-1970. Okay, I am finished investigating now.
These coasters are in a clear case that has foam in the bottom. I don't think these were ever used.
Also, here is a pic of a set made by Teraco Line USA that were for the dairy industry. They are loose and not in a case.
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