Helena AE Follis, Antioch. AD 317-324. 

FL HELENA AVGVSTA, mantled bust right wearing necklace and ladder-shaped diadem with a pearl in each section.
SECVRITAS REIPVBLICAE, Securitas standing left, lowering branch with right hand, raising hem of robe with left hand.

Mintmark SMANTA. 

RIC 80; Sear 16627. 

Sold by Münzzentrum Rheinland - Auction 194, Lot 998, Sept. 2021.