Severus Alexander, AE As. AD 231. 

IMP SEV ALEXANDER AVG, laureate, draped, cuirassed bust right.
PROFECTIO AVGVSTI, SC in ex., Emperor on horseback, riding
left, holding spear and raising right hand.

RIC 595; Cohen 489; Sear 8095 var (bust type)

With permission of ArtCoinsRoma, Dec. 2012.