This artifact was a small circular medallion on which was depicted in bas relief, Mithras slaying the bull. This medallion, carved of white crystalline marble is .075 m in diameter and .01 m. in thickness. On its reverse a finished bevel reduces the reverse diameter to .065 m. while the reverse surface was left with a rough comb dressing.

The observe of the medallion is divided horizontally into two registers depicts three scenes from the life of Mithras.