Helena AE Follis, Antioch. 328-329 AD. 

FL HELENA-AVGVSTA, mantled bust right with necklace, wearing ladder-shaped diadem
SECVRITAS-REIPVBLICE, Securitas standing left, lowering 
branch with left hand, raising robe with right hand. 

Mintmark dot SMANTI. 

RIC VII Antioch 82; Sear 16627

With permission of Gerhard Hirsch Nachfolger, Feb. 2014.