Recent discussions about hypothetical D&D economies led me to look into Roman currency. Here is a great wikipedia image of the common currency in the 27 BC - 100 AD Roman era.

So instead of copper, silver, electrum gold (the D&D standard), the early Roman Empire used various iterations of Bronze, Orichalcum, Silver, Billon, and Gold.

And today I learned Billon is the name for an alloy of silver and gold, or silver and copper, or silver and gold and copper, or basically any alloy of silver and some base metal.

https://en.wikipedia.org/wiki/Roman_currency#Imperial_period:_27_BC_%E2%80%93_AD_476

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