Severus Alexander AV Aureus, Rome, 6.12 g. AD 222. 

IMP C M AVR SEV ALEXAND AVG, laureate, draped and cuirassed 
bust right, seen from the back.
P M TR P COS PP, Salus seated left by altar, holding patera, 
feeding serpent rising from the altar, resting left elbow on 
the arm of the chair.

RIC 13; Cohen 219 var; BMC 32; Calico II 3085. 

Sold by Gorny & Mosch, Oct 2012.
Estimate 5,000 Euros.