Certified Roman Silver Denarius!
This Silver Denarius was struck sometime during the reign of Emperor Commodus (177 - 192 AD). Commodus was the son of the Emperor Marcus Aurelius. He became insane and believed he was the reincarnation of Hercules, and was assassinated in 192 AD.
The obverse shows a right facing bust with the inscription "M COMM ANT P FEL AVG BRIT." Reverse designs may vary, but the inscription "NOBILIT AVG P M TR P XII IMP VIII COS V P P" is typical. Appoximate specs are 18mm and 2.8g. Graded Choice Very Fine by NGC.