Constantine I. 307-337 AD. AE Follis. Struck 317 AD. Heraclea mint. 

IMP CONSTA-NTINVS AVG, laureate and draped bust left, holding 
mappa, globe and sceptre.
PROVIDEN-TIA AVGG, campgate with three turrets, no door, six 
layers. 
Mintmark MHT epsilon. 

RIC VII Heraclea 16.
Rated R5. Extremely rare. 

Contributed by Welington Maciel, Feb. 2013.