Constantine II AE3 Constantinople. 2.55g. AD 324-340.
ebay AAH 3959000096  
(original description and attribution corrected)

CONSTANTIVS IVN NOB C, laureate, cuirassed bust right.
GLOR-IA EXERC-ITVS, Two soldiers facing each other, each holding spear and resting hand on shield, two standards between them. 

Mintmark dot CONSB dot.

RIC VII 81.