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Constantius II. AE17 of Siscia. Struck 351-355 AD. 

DN CONSTAN-TIVS PF AVG, pearl-diademed, draped and cuirassed bust right.
FEL TEMP-REPARATIO, soldier standing left, one knee 
raised, spearing fallen horseman who is unbearded, 
wearing a Phrygian helmet and reaching backwards.

Mintmark BSIS zigzag.

RIC VIII Siscia 361.
Rated C3.

Note the difference between RIC VIII Siscia 352 and
the seemingly identical RIC VIII Siscia 361.
RIC 352 is usually 18-19 mm and weighs 2.4-2.5g.
RIC 361 is usually 16-18 mm and weighs 2.25-2.3g