Severus Alexander AR Denarius. 2.87 grams, 18.37 mm. Rome. 222 AD. 

Obv: IMP C M AVR SEV ALEXAND AVG, laureate, draped & cuirassed bust right 
Rev: P M TR P COS P P, Salus seated left, feeding snake arising from altar.

RIC 14; RSC 218: Sear 7894.

Used with permission of TimeLine Originals (www.time-lines.co.uk), Nov, 2010