A nice piece.
Patina, tarnish.
Obverse: bust of the emperor wearing a laurel wreath, with a daperia on his left shoulder, to the right, in the rim the legend:
IMP CAES NERVA TRAIAN AVG GERM;
Reverse: Victoria standing left, holding laurel wreath and branch, surrounded by legend:
P M TR P COS IIII P P;
Silver, diameter 19 mm, weight 3.37 g, axis 6 h.