Gordian III and Serapis, AE30 Pentassarion of Dionysopolis. 

AVT K M ANTWNIOC GORDIANOC AVG, laureate, draped, 
cuirassed bust right, facing bust of Serapis wearing modius.
DIONYCOPOLEITEN, Herakles standing left, leaning on club
 and holding lionskin. value mark E in right field.

Varbanov 553.
Note: This image was recovered after having been destroyed 
in the March 2009 website attack. The owner or seller
information was unfortunately lost. Re-added in September, 2011.