RIC doesn't list any four turreted no doors campgates for Constantine II...it should come after RIC 189
Constantine II
A.D. 318- 319
18x19mm 3.4g
CONSTANTINVS IVN NOB C; Laureate, draped and cuirassed bust right.
VIRTV-S AVGG; camp gate with four turrets and no doors; P-R across fields.
in ex. RQ
RIC VII Rome –