Constantine II, AE follis, 326 AD. Heraclea.

CONSTANTINVS IVN NOB C, laureate, draped, cuirassed bust right.
PROVIDEN-TIAE CAESS, campgate, 6 layers, two turrets, no doors.
Mintmark SMHB dot.

RIC VII Heraclea 83.
Very rare. Rated R4.

With permission of Online Store of Forum Ancient Coins, 2011.