Constantius II, AE follis, Siscia. 19mm, 2.77 g. AD 367-375. 

DN CONSTAN-TIVS PF AVG, pearl and rosette-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 BSIS [SYM2]. (symbol 2 resembles a retrograde R)

RIC VIII Siscia 243 var (bust type).
Rated rare.

With permission of Roma Numismatics Ltd - E-Sale 57, Lot 1083, May 2019.