Constantius II, AE3 of Rome.

DN CONSTAN-TIVS PF AVG, laurel and rosette-diademed, draped, cuirassed bust right.
FEL TEMP-REPARATIO, soldier spearing fallen horseman who is 
bare-headed (hair straight up), reaching backwards.

Mintmark R wreath T.

RIC VIII Rome 310.

Dane's collection, Jan. 2016.