This one looks like the mintmark has a dot in it, if so, it is unlisted in RIC with a Chi-Rho on the banner. If there is not a dot it is RIC VIII Aquileia 33. I will verify it when I get the coin.
Constantius II
A.D. 337- 340
16mm 1.3gm
CONSTANTIVS PF AVG; laurel and rosette diademed, draped and cuirassed.
GLOR-IA EXERC-ITVS; Two soldiers helmeted, stg. facing one another, reversed spear in outer hands, inner hands on shields resting on the ground; between them one standard inscribed with a Chi-Rho.
In ex. dot AQS
Cf. RIC VIII Aquileia 13