Thanks everyone for participating in the discussion. I also think the coin is authentic. It's very rare Commodus denarius RIC 117b.Bust of Commodus, laureate, drapery on left shoulder, right https://numismatics.org/ocre/id/ric...117b?lang=en
This coin actually has a cuirassed bust; which is not listed in RIC. This type is listed in BMCRE (Coins of the Roman Empire in the British Museum) number 184.
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