Caracalla, AR Denarius, Rome, 214 AD.

ANTONINVS PIVS AVG, laureate head right.
PM TR P XVII COS IIII PP, Salus seated left, holding serpent in right hand, resting 
left elbow on back of chair

RIC 82 var (reverse type, no altar); Sear 6860 var (ditto); RSC 422 var (ditto).

Rare.

With permission of dirtyoldcoins.com, 2008.