Helena AE Follis. Trier.

Obv: FL HELENA-AVGVSTA, diademed bust right wearing mantle and necklace 
Rev: SECVRITAS-REIPVBLICE, Securitas standing left, lowering branch with left 
 hand, raising robe with right hand. 
Mintmark: STRE. 

RIC VII Trier 508, rated C3

Ebay sale, uncertain seller, before 2002.