Indeed it is a Marcus Aurelius denarius, from his 2nd year as emperor (TR P XVI meaning his 16th year receiving the Tribune powers, a position he had filled as Caesar under Antoninus Pius for 15 years.) Looks perfectly genuine to me; it is a common, not terribly valuable coin.
This particular reverse was used because Aurelius shared the post of emperor with his adoptive brother Lucius Verus. Verus was a party boy, largely disinterested in politics, and many called for him to step down. Fearful of an assasination attempt, Aurelius used this coin to stress Concordia (harmony) between the emperors, and promised his daugher's hand in marriage to Verus.
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