Gordian III and Serapis, AE26 of Odessos, Thrace.

AVT K M ANT GORDIANOC AVG, laureate draped bust of Gordian 
right, facing bust of Serapis left, wearing polos, cornucopiae
to right.
ODHCCEITWN, Emperor, in military dress, wearing cuirass and
chlamys, standing facing, head left, holding patera and spear.
E in left field.

Varbanov 4490.