Constantius II, AE, Arles. 325-326 AD. 

Obv: FL IVL CONSTANTIVS NOB C, laureate, draped, cuirassed bust left
Rev: VIRTVS-CAESS, campgate, 5 layers, 4 turrets, 
open doors with panels marked with two dots in each panel. 

Mintmark: QA crescent RL. 

RIC VII Arles 297 rated R1

Courtesy of deamoneta.com, Feb. 2010