Gordian III, AE28 of Nikopolis ad Istrum.

AVT K M ANTW GORDIANOC AVG, radiate, cuirassed bust right,
aegis on chest.
VP CAB MODECTOV NIKOPOLEITWN PROC ICTPON (ON ligate), 
Zeus seated left, holding patera and sceptre, eagle
at foot.

Varbanov 4131 (this coin); AMNG 2041.
Note: a 27mm version is listed under Varbanov 4248
(illustrated as 4247 in error).

With kind permission of Gorny & Mosch, auction 2002, lot 1609.