Gordian III and Tranquillina, AE 27 of Anchialus, Thrace.

AYT K M ANT GORDIANOC AYG CEB TRANKYLLINA, laureate and
draped bust of Gordian right, facing draped bust of 
Tranquillina left.
OVLPIANWN AGXIALEWN, City gate with towers, arched 
doorway with wall and towers, with three arches along 
the top of the wall.

Varbanov 679 (this coin).
With kind permission of Ray Wilk of citygate.ancients.info.