Here's a nice example of this type. It has a pretty complete legend, these are usually on small flans and are very crowded.
This is one of the few coins of Constantine with clear Christian symbolism, though I believe the portrait doesn't really look a lot like he would have actually looked in 336.
Constantine I
A.D. 336
16mm 1.4gm
CONSTANTI-NVS MAX AVG; rosette-diademed, draped and cuirassed bust right.
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. PCONST
RIC VII Arles 394
