321 AD., Crispus Caesar, Arelate mint, Follis, RIC 235.

Crispus Caesar, Arelate (Arles) mint, 3rd officina, 321 AD.,
Æ3 / Follis (18-20 mm / 3.01 g),
Obv.: CRISPVS - NOB CAES , laureate bust of Crispus right.
Rev.: CAESARVM NOSTRORVM / VOT / V (in laurel wreath) / T (crescent) A (in exergue).
RIC VII Arles 235.

the reverse means "The Prince of our people offers vows so that he may serve for a prosperous five years."