Gordian III & Tranquillina AE27 of Anchialus, Thrace. 

AVT K M ANT GORDIANOC AVG CAB CEB TRANKULEINA, laureate head 
of Gordian right, facing draped bust of Tranquillina left

OULPIANWN AGCIALEWN, Serapis standing facing, head left, 
wearing long robes, holding short sceptre and raising right 
hand. 
Moushmov 2959

Ancient Coin Art, 2003. Found in an old "Mystery Coins"
folder and uploaded June 2010.