Image rights: wildwinds.com

Constans, AE follis, Siscia. AD 346-348. 

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, chi-rho on banner. 

Mintmark ASIS dot-in-crescent.

RIC VIII Siscia 100.
Rated C2