Severus Alexander AE Sestertius, Emperor reverse

Severus Alexander (222-235 AD). AE Sestertius (31 mm, 17.81 g), Rome, 223.
Obv. IMP CAES M AVR SEVALEXANDER AVG, laureate, draped and cuirassed bust to right, seen from behind.
Rev. P M TR P IIII COS P P / S C, Emperor standing front, head to left, sacrificing out of patera over lighted altar.
RIC 437; BMC 263.