Roman Empire. Commodus, 177-192 AD. AR Denarius. Rome Mint. 3.37g.
 
Obv: M COMM ANT P FEL AVG BRIT P P, laureate head right. Rev: APOL MONET P M TR P XV, Apollo standing right, right hand on head, resting left arm on column; COS VI across field.
 
An old grey tone.