Valentinian I, AE3, Arles. 364-367 AD.

DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed 
bust right.
SECVRITAS-REIPVBLICAE, Victory advancing left, holding
 wreath and palm.
No fieldmarks.
 
Mintmark: dot delta SISC.

RIC IX Siscia 7a, type ii(b)

Contributed by Forum Ancient Coins, online store item 11147.