Valentinian I. AE3, Siscia unlisted.

DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right.
SECVRITAS-REIPVBLICAE, Victory advancing left, holding wreath and palm branch.
Star over A in left field.
Mintmark DASISC
Would be RIC IX Siscia 7a, type vii (fieldmark missing in RIC for Valentinian. Listed for Valens as 7b, vii).

From Dane's collection, Nov. 2014.