A nice piece. Patina.
Obverse: head in laurel wreath, to the right, in the rim legend:
CONSTANTINVS IVN NOB C;
Reverse: wreath, within it legend:
VOT/V, in the rim legend:
CAESARVM[];, in section Qhalf-moon with starA;
Bronze, diameter 16.5 x 18 mm, weight 1.9 g, axis 6 h.