This workshop is not listed in RIC. Lech has an example (second picture below) on his page that is a die match with this coin.
https://www.forumancientcoins.com/notinric/7ant80_a.htmlHelena
A.D. 327- 328
19mm 3.2gm
FL HELENA AVGVSTA; diademed and draped bust right.
SECVRITAS REIPVBLICE; Securitas standing left, lowering branch, raising robe with right hand.
In ex. SMANTA
RIC VII Antioch 80
EDIT- I think that the workshop is actually a B. I have another example that I will post later.