Crispus AE Follis. 317 AD. 

Obv: FL IVL CRISPVS NOB CAES, laureate, cuirassed bust right
Rev: PRINCIPI IVVENTVTIS, Crispus, laureate, in military dress, cloak spread, standing right holding transverse spear and globe, T-F across fields, dot ATR in ex. 

RIC VII 142, rated R4.

With permission of Roma Numismatics, June 2009