Constantine II, AE follis, Rome. AD 318-319. 

CONSTANTINVS IVN NOB C, laureate, draped, cuirassed bust right.
VIRTVS AVGG, campgate with seven layers, three turrets, 
closed doors. 

P-R across fields. 
Mintmark RT. 

RIC VII Rome 183. 

Submitted by Rick Morton, capitolinecoins.com, Summer 2014.