Constantius II. AE17 of Rome.

DN CONSTAN-TIVS PF AVG, laureate and rosette-diademed, 
draped, cuirassed bust right.
FEL TEMP-REPARATIO, soldier spearing fallen horseman who 
is bare-headed, reaching backwards.
Mintmark RP.
RIC VIII Rome 273.
Rated scarce.

Dane's collection, July 2014.