Carl from Santee's Comments
I knew this one right away. It's an ancient Hawaiian Lei from the Iron Age. It's in really good shape, but heck, those things lasted forever.
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Perhaps it's a plastic spur for an urban cowboy?
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It looks to me like a brass, face guard for a one-eyed, gladiator owl. It's been flattened of course.
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Dinosaur dentures! I saw them in a museum once.