Helena, AE follis of Constantinople. 326-327

FL HELENA-AVGVSTA, mantled bust right, wearing ladder-
shaped diadem, decordated with pearls.
SECVRITAS-REIPVBLICE, Securitas standing left,  lowering 
branch with left hand, raising robe with right hand. 
Officina letter B in left field.
Mintmark CONS. 

RIC VII Constantinople 11; Sear 16618
Rare, rated R2.