Gordian III, AE Sestertius. Rome mint. 240 AD. 

Obv: IMP GORDIANVS PIVS FEL AVG, laureate, draped, cuirassed bust right.
Rev: PAX AETERNA SC, Pax running left, holding branch and sceptre. 

RIC IV-3, 319a.

Image courtesy of Barry Murphy, Forvm Ancient Coins, Sept 2010.