Vintage Stroh’s Beer Plastic Coaster set

[c Thompson]

I have this set of Vintage circa 1975? Stroh’s Beer coasters. They are stamped Research Plastics Warren MI c1975. I have searched extensively, even found the obituary for the founder of the company, but can’t find any other coasters, or any info about them. Hopefully someone can help, or point me in the right direction. I apologize for the poor photos, I could email better ones if needed.

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