This coin is RIC VII Rome 180, but RIC only lists workshop P. Other examples from S are known though.
Crispus
A.D. 318- 319
CRISPVS NOB CAES; bust left, laureate and cuirassed with spear pointing forward, shield on left arm.
VIRTV-S AVG; camp gate with three turrets and closed gates. P/R across fields.
In ex. RS
RIC VII Rome 180