239 AD., Gordian III., Rome mint, Antoninianus, RIC 38.

Gordian III., Rome mint, emission 3a, 239 AD.,
Æ (20-23 mm / 3,58 g),
Obv.: IMP CAES M ANT GORDIANVS AVG , radiate, draped and cuirassed bust of Gordian right, seen from behind.
Rev.: ROMAE AE-TERNAE , Roma, helmeted, in military dress, seated left on oval shield, holding Victory in her right hand and spear in her left.
RIC IV, III, 19, 38 (common) ; Coh. 312 .

Chronology according K. Pink, Der Aufbau der römischen Münzprägung in der Kaiserzeit, III, Numismatische Zeitschrift 68 (1935), p 12-34.