Constantine I AE Follis. 318-319 AD. 18mm, 2.79 g.

Obv: CONST-ANTINVS AVG, laureate, helmeted and cuirassed 
bust right
Rev: VIRTV-S AVGG, campgate, three turrets, six layers with 
base, closed, panelled doors, with dot in each section; 

P-R across fields
Mintmark RT.

RIC VII Rome 176; Sear 16306.

With permission of Roma Numismatics E-Sale 34, Lot 370, Feb 2017