A nice piece.
Obverse: bust of the emperor in radial crown, armor and paludamentum, to the right, in the rim legend:
AYT K G ME KY DEKIOC TRAIANOC CEB;
Reverse: eagle to the right, in the rim legend:
ΔHMAPX ΕΞOYCIAC, in the SC imprint.
Silver, diameter 26 mm, weight 11.37 g, axis 11 h.