Gordian III AV aureus. AD 238, Rome. 

IMP CAES M ANT GORDIANVS AVG, laureate, draped and cuirassed bust right.
IOVI CONSERVATORI, Jupiter standing holding thunderbolt over Gordian standing left, and sceptre.

RIC IV-3 8; Cohen 104.
Scarce.

Image courtesy of the British Museum inv. R73.