Constantine I AE Follis. 21mm. Rome mint, 318-319 AD.

Obv: CONST-ANTINVS AVG, helmeted, cuirassed bust right
Rev: ROMAE A-ETERNAE, Roma, seated right, holding shield 
inscribed X/V in lap.

RIC VII, Rome 146

Contributed by Chip ("Gunner") Gruszczinski, April 2010.