Crispus AE follis. Rome. 324-325 AD.

FL IVL CRISPVS NOB CAES, laureate, draped, cuirassed bust left.
PROVIDEN-TIAE CAESS, campgate, 11 rows, two turrets, star above,
one dot in doorway.
Mintmark RS.

RIC VII Rome 266, rated R1.

With permission of Roma Numismatics, April, 2011

Note: There can be anything from 0 to 3 dots in the doorway
of this issue.