Marcus Aurelius, AE24 of Serdica, Thrace.

AV KAI M AVPH ANTWNEIN, bare-headed, draped and cuirassed bust 
right. 
CERDWN, River god Oiskos, bearded, bare-chested, seated left on 
waves, head right, holding branch in right hand and 
resting left arm on rock.

Ruzicka 2; Vienna 8211; Moushmov 4757; Varbanov 1877.