Trajan Decius. Rome mint, 4th officina. 3rd emission, early to mid AD 250. Silver Antoninianus (21.5mm, 4.63 g)

Obv: IMP C M Q TRAIANVS DECIVS AVG Bust of Trajan Decius, radiate, cuirassed, right, seen from behind

Rev: ADVENTVS AVG Trajan Decius on horseback left, raising his right hand in salute and holding long sceptre in his left.

The reverse type depicts the arrival of the new emperor in Rome.

RIC IV 11b; RSC 4.