Interesting South Haven Michigan trinket! It looks like a dog tag but I'm not sure exactly what this was used for! Engraved with South Haven, MI and the state of Michigan seal.  Measures approx. 1.25" X 1.25".  Made of metal, not sure exactly what material perhaps a silver plated copper or brass material. Unsure of the exact age but it's been in our collection for over 30 years.