This coin has an unlisted officina. Lech already has an example-
http://www.forumancientcoins.com/notinric/7tic209_t.htmlHelena
A.D. 326- 327
FL HELENA AVGVSTA; diademed and draped bust right.
SECVRITAS REIPVBLICE; Securitas standing left, lowering branch, raising robe with right hand.
In ex. T palm branch T
RIC VII Ticinum 209