The coin was minted in 43-42 BC by Brutus and his supporters, who murdered Julius Caesar in March 44 BC, he explained.
The wreath in particular was a sign of someone who wants to promote himself as emperor, Baldacci said, and its circulation offered propaganda value for Brutus.
Weighing eight grams and similar in size to a euro, it is a piece of history marking the last chapters of the Roman republic.
It is one of only 17 known artefacts of its kind, the auction house said.
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