318 AD., Crispus, Arelate mint, Follis, RIC 163.

Crispus as Caesar, Arelate mint, officina 4, 318 AD.,
Æ Follis (18-20 mm / 3,16 g),
Obv.: CRISPVS NOB CAES , laureate, draped and cuirassed bust of Crispus r.
Rev.: PRINCIPIA I - VVENTVTIS / Q (*-in-crescent) A , Mars stg. l., helmeted, nude, wearing boots, chlamys across l. shoulder, leaning on shield, holding vertical spear.
RIC VII, 250, 163 (R4) ; http://www.wildwinds.com/coins/ric/crispus/_arles_RIC_163.txt .