Gordian III and Serapis, AE26 of Odessos, Thrace.

AVT K MA ANTWNIOC GORDIANOC, laureate draped bust of Gordian 
right, facing bust of Serapis left, wearing polos.
ODHCCEITWN, Demeter standing left, holding corn-ears and sceptre.
E in left field.

Varbanov 4478.