Constantine II, AE3. Siscia, 337-348 AD. 

CONSTANTI-NVS MAX 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 96.

From Dane's collection, August 2010.

Known mintmarks for this RIC number:
ASIS dot in crescent
BSIS dot in crescent
epsilon SIS dot in crescent