This is a nice example of this type with the Chi-Rho between the standards. It is harder to find than the single standard with a Chi-Rho.
Constantine I
A.D. 334
19mm 2.5gm
CONSTANTI-NVS MAX AVG; rosette-diadem, draped, cuirassed bust.
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 two standards, Chi-Rho between the standards.
in ex. PCONST
RIC VII Arles 381