Gordian III, AE26 of Tomis, Thrace. 

AVT K M ANTWN GORDIANO, laureate, draped, cuirassed bust right.
MHTRO PONTOY TOMEWC, Nemesis standing left, holding scales and 
rod; wheel at foot left. 
Delta in left field. 

Varbanov 5627 (this coin); Moushmov 2244.