Caracalla, AR denarius, Rome. AD 207. 2.72 g.

ANTONINVS PIVS AVG, laureate head right.
PONTIF TR P X COS II, winged head of Medusa facing.

RIC 164 var (rev. legend); RSC 526 var (ditto). RIC -; Cohen 
-; RSC -; Sear -. Agallopoulou, "Excavations at Patras", 2, AEAT 35 (1980), B1, 1 (1988), p. 182.

The image is taken from the article mentioned above.