Severus Alexander Billon Tetradrachm. Year 4 = 224-225 AD. Alexandria, Egypt. 

A KAI M AVP CEOVHP ALEXANDROC EU CEB, laureate, draped and cuirassed bust right
L TETARTOU, Sarapis seated left, crowned with modius, wearing himation, right hand stretched out downwards, left hand resting on sceptre, on high-backed throne; before his feet, Kerberos seated. 

Milne 2942. Scarce.

Contributed by Dane for Roma Numismatics, June 2008