Constantine I AE follis, Arles, AD 327. 

CONSTANTINVS AVG, laureate head right.
VIRTV-S AVGG, campgate, two turrets, seven layers, star above, 
S-F across fields. 

Mintmark ARLP.

RIC VII Arles 313; Sear 16309.

With permission of Zach of beastcoins.com.