Constantius II, AE17, Siscia.

Obv: DN CONSTAN-TIVS PF AVG, rosette-diademed, draped, cuirassed bust right.
FEL TEMP-REPARATIO, soldier spearing fallen horseman who is
wearing a Phrygian helmet, reaching backwards.
M in left field, mintmark BSIS zigzag

RIC VIII Siscia 369 var (obv with rosette diadem + horseman's headwear).

Gordon Jensen's collection, Jan. 2011