A nice piece with very well preserved details.
Obverse: bust of the emperor in pearl diadem, armor and paludamentum, to the right, in the rim legend:
D N VALENTINI-ANVS P F AVG;
Reverse: Victoria walking left holds wreath, in rim legend:
SECVRITAS REIPVBLICAE, in fields */A, in segment *DSISC;
Bronze, diameter 17 x 19 mm, weight 2.2 g, axis 6 h.