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I'm surprised how low quality the article is given the topic. It defines coins as necessarily using precious metal so that it can say the Greeks were first but then refers to earlier bronze coins made in China.

I don't think it's defining them as made of precious metal, just stating that the earliest *were*, and providing inconsistent info from the rest of the article with regard to what the earliest coins were. I'm guessing one of those things just wasn't updated when the other was edited in.