Constans, AE3 of Siscia. AD 340-343. 

DN CONSTANS PF AVG, laurel and rosette-diademed, draped and cuirassed bust right.
FEL TEMP REPARATIO, emperor standing left on galley, holding phoenix and labarum, Victory sitting at the helm, steering the ship. 
Mintmark ASIS[symbol 4b]R. 

RIC VIII Siscia 207 var (symbol for off. A)
This symbol is usually only associated with officina 4 (Delta).

Eidmar auction 15, lot 472, May 2025.