Constantine II. AE4, Heraclea, 337-348 AD.

CONSTAN-TINVS AVG, laureate and rosette-diademed head only, right.
GLOR-IA EXERC-ITVS, two soldiers holding spears and shields 
with one standard between them. O on banner.

Mintmark: SMH gamma

RIC VIII Heraclea 16, rated Scarce.

From Dane's collection, August 2010.

Known mintmarks for this RIC number:
SMHA
SMHB
SMH gamma
SMH delta
SMH epsilon