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Constantius Gallus, AE 19mm. Siscia. 

DN CONSTANTIVS IVN NOB C, bare-headed, draped, cuirassed bust right.
FEL TEMP-REPARATIO, soldier spearing fallen horseman who 
is wearing a Phrygian helmet, reaching backwards. 
No fieldmark. 
Mintmark ASIS.

RIC VIII Siscia 351.
Rated C3.