Constantine I AE follis, Arles, AD 329. 

CONSTANTINVS AVG, rosette-diademed head right.
VIRTVS AVGG, campgate, four turrets, seven layers with dots in the top layer, star above, no door.

T-F across fields.
Mintmark PCONST.

RIC VII Arles 337; Sear 16311.

Rated R1.

With permission of Zach of beastcoins.com.