A typologically interesting piece. Patina, tarnish.
Obverse: emperor's head in laurel wreath, to the right, in the rim legend:
ANTONINVS AVG PIVS P TR P XII;
Reverse: Salus standing left, feeds a snake from a platter and holds a helm, in the rim legend:
COS IIII;
Silver, diameter 18 mm, weight 3.37 g, axis 6 h.