Valentinian I. AE3, Siscia. 17 mm, 2.85 g. AD 367-375. 

DN VALENTINI-ANVS PF AVG, pearl-diademed, draped, cuirassed bust right.
SECVRITAS-REIPVBLICAE, Victory walking left, holding wreath and palm branch.

Symbol 3 over A in left field. Q in right field
Mintmark Gamma SISCV.

RIC IX Siscia 15a, type xxx var (left field marks positions). 
With permission of Fritz Rudolf Künker GmbH eLive Auction 43, Lot 517, Dec 2016.

Another example was sold in Inasta auction 63, Lot 1408, March 2016.