Roman Empire. Gordian III, 238-44 AD. AE Pentassarion. Odessos, Moesia Inferior. Varna, Bulgaria Mint. 
 
Obv: AYT K M ANT ΓOPΔIANOC, facing busts of Gordian left, Serapis right wearing kalathos on head. Rev: OΔHCCEITΩN, Athena standing right, wearing helmet with spear in right hand, resting left on shield set on ground, E (mark of value) lower right.
 
A rich olive patina.