One of the first antoninian - double denarii minted since the Caracalla reforms.
A nice piece of a typologically rarer item.
Obverse: bust of the emperor wearing a radial crown, armor and paludamentum, to the right, in the rim legend:
IMP CAES M AVR ANTONINVS AVG;
Reverse: Salus standing right, feeds a serpent from a platter, surrounded by legend:
SALVS ANTONINI AVG;