Constantius II, AE follis, Siscia. 24 mm, 5.14 g. AD 367-375. 

DN CONSTAN-TIVS PF AVG, pearl-diademed, draped, cuirassed bust right. 
FEL TEMP-REPARATIO, Emperor in military dress standing on galley moving left, holding Phoenix and labarum. Victory sitting at the stern, steering the ship.

Mintmark Epsilon SIS [SYM4]. (symbol 4 resembles a Y)

RIC VIII Siscia 243 var (symbol for this issue).
Rated rare.

ww