Septimius Severus. BI Tetradrachm, 24mm, 12.89 g. Dated Year 6, AD 197-198).

AYT K L CEP CEYH EY CE PERT CEB ARA ADI, laureate head right.
L digamma in upper left field, Serapis seated left on throne, modius on head, Kerberos sitting left at foot. 

Dattari 9203; Dattari Savio 3995 (this coin); Milne -.(this coin); Staffieri, Alexandria 193 (this coin)

With permission of cngcoins.com, Triton XXI, Staffieri collection, lot 193.