For this campgate, RIC lists sub-issues according to dots. The first issue (a) has no dots, while (b) has a dot in the arch (c) has a dot in the arch and one in the brick over the door (d) has a dot in arch and a dot in two bricks over the door and (e) has a dot in the arch and three in the bricks over the door.
Constantine I
A.D. 324- 325
17mm 3.3gm
CONSTAN-TINVS AVG Laureate head.
PROVIDEN-TIAE AVGG; camp gate, two turrets, no doors, star above, dot in doorway and two in bricks over the door.
In ex. R P
RIC VII Rome 287d