Constantius II, AV Semissis, Arles. 

Obv: DN CONSTAN-TIVS PF AVG, pearl diademed, draped, cuirassed bust right.
VICTORIA AVGVSTORVM, Victory seated right, holding
shield inscribed VOT XXXX on her knee, before her
stands a a small genius supporting the shield. 

Mintmark KONSATV (ATV in monogram form).
RIC VIII Arles 241; Cohen 247; 

Very rare!

Found in England. Submitted by the finder via DGCoins.