A nice piece in dark patina.
Obverse: emperor's head in laurel wreath, to the right, in the rim legend:
ANTONINVS AVG PIVS P P.
Reverse: hands hold a winged caduceus and ears of grain, surrounded by legend:
COSIIIIII
Silver, diameter 17 x 18 mm, weight 2.93 g, axis 6 h.