Constans, AE4, Siscia.

CONSTAN-S PF AVG, laurel and rosette-diademed, draped, 
cuirassed bust right.
GLOR-IA EXERC-ITVS, two soldiers holding spears and shields 
with one standard between them, dot on banner.
Mintmark: delta SIS star.
RIC VIII Siscia 78, rated common.

From Dane's collection, Sept. 2012.