A nice, fully legible piece.
Obverse: bust of Augustus in armor and diadem, to the right, in the rim legend:
CONSTAN-TINVS AVG;
Reverse: camp gate of 7 rows of bricks, with open gate, in the rim legend:
PROVIDEN-TIAE AVGG; in right field -, in segment SMTSGamma;
Bronze, diameter 18 20 mm, weight 2.76 g, axis 12 h.