A very nice piece.
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: Roma seated on throne to left, holding Victoria and spear, surrounded by legend:
P M TR P II COS II P P;
Silver, diameter 23 mm, weight 4.52 g, axis 6 h.