Gordian III and Tranquillina, AE28 Pentassarion of Istros, Thrace.

Obv: AVT K M ANT GORDIANOC CAB TRANKVLINA, laureate, draped 
bust of Gordian right, vis-à-vis draped bust of Tranquillina 
left.
Rev: ICTRI/HNWN, Mitras on horseback right, small altar 
before, (bird perched on tall column, off flan to left), 
value mark E in right field.

Varbanov 688.

Used with permission of www.cgb.fr, Feb, 2011