A very nice piece.
Obverse: Emperor's head in laurel wreath, clockwise, in the rim legend:
ANTONINVS PIVS AVG;
Reverse: the emperor stands to the right, holding a parazonium and a spear, in the rim the legend:
PONTIF TR P X COS II;
Silver, diameter 19 x 18 mm, weight 3.09 g, axis 7 h.