Valens, AE3 of Aquileia. 

DN VALEN-S PF AVG, pearl diademed, draped, cuirassed bust right.
SECVRITAS-REIPVBLICAE, Victory advancing left, holding wreath and palm.
Left field: Chi-Rho.
Mintmark SMAQS.

RIC IX Aquileia 9b, type vii

Courtesy of Raz, dirty old coins, April 2010.