This type is only listed in RIC from Siscia, but examples are known for both Constantius II and Gallus from Sirmium.
Constantius II
A.D. 351
19mm 2.1gm
DN CONSTANTIVS P F AVG; pearl- diademed, draped and cuirassed bust.
VICTORIA CAESARIS; Victory walking left holding wreath and palm branch
In ex. SIRM
RIC VIII Sirmium –