Gallienus, AE25 of Serdica, Thrace.

AVT K GALLIHNOC, radiate, draped, cuirassed bust left, holding
spear and shield.
OVLPIAC CERDIK, coiled serpent with multiple coils and radiate 
head right. 

Ruzicka 501; Sofia 3721.

With permission of Ed Flinn of the Gallienus website, 2010.