Constans AE4, 335-341 AD. 

FL I CONSTANS NOB CAES, laureate, draped and cuirassed bust left.
GLOR-IA EXERC-ITVS, two soldiers holding spears and shields with one standard between them; o on banner.

Mintmark: SMH Epsilon.

RIC VII Heraclea 154.

Image courtesy of the Münzsammlung des Seminars für Alte Geschichte der Albert-Ludwigs-Universität, Freiburg.