Constantine I. AE Follis. AD 329. Arles. 

CONSTANTINVS AVG, pearl-diademed head right.
VIRTVS AVGG, campgate, four turrets, six layers with dots in 
arches in top layer, star above, doors open. 

T-F across fields.
Mintmark PCONST. 

RIC VII Arles 331; Sear 16311.
Very rare, rated R5.

With permission of Zach of beastcoins.com.