Constantius II, AE of Siscia.

DN CONSTAN-TIVS PF AVG, pearl diademed, draped, cuirassed bust right.
FEL TEMP REPARATIO, radiate phoenix standing right on rocky
mount.
Mintmark: epsilon SIS[SYM4]

RIC VIII Siscia 240 var (symbol)
Scarce.

RIC lists only symbol 5 for officina epsilon.