A nice piece with very good details.
Obverse: bust of the emperor wearing laurel wreath, armor and paludamentum, to the right, in the rim legend:
IMP ANTONINVS PIVS AVG;
Reverse: Liberalitas standing left, holding abacus and horn of plenty, surrounded by legend:
LIBERALITAS AVG II;
Silver, diameter 18 mm, weight 2.73 g, axis 12 h.