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

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

C over Symbol 4 in left field, S over dot in right field.
 
Mintmark: gamma SISC [symbol 1].

RIC IX Siscia 15a, type xxxviii

Courtesy of Atlantis Coins Ltd.