Was any other metal than gold, silver or copper ever in history used to back a currency?
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$\begingroup$ Not quite sure if you only mean paper currency backed by metals or actual metal coins as well. $\endgroup$– GiskardCommented Aug 10, 2021 at 6:27
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1 Answer
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Roman bronze coins: Aes Grave
Chinese bronze coins: Ban liang (one type was bronze, not all)
A non-metal "currency" backed by various industrial metals: the cryptocurrency Tiberius coin.