A circulating piece with nice details.
Obverse: bust of Caesar in armor and paludamentum, wearing a laurel wreath, left, in the rim legend:
CONSTANTINVS IVN NOB C;
Reverse: camp gate of 6 rows of bricks, with open gate, in the rim legend:
PROVIDEN-TIAE CAESS; in section SMALB;
Bronze, diameter 19 mm, weight 2.51 g, axis 12 h.