Helena Ae3, Securitas Rev. / Cyzicus Or Heraclea Mint?

An impulse bid, since (Saint) Helena is both a rather interesting historical figure and one for whom I had no coins. A bit surprised that I won the auction, but seller's photos are small and low quality, so that may be a contributing factor.

AE3 - Helena.

I am having trouble discerning from these pics if this is a Heraclea or Cyzicus mint. It looks like SMH (Epsilon) or SMK (Epsilon) to me. I am leaning towards Heraclea since the Cyzicus AE's I have seen tend to have a dot in the right reverse field or before the S in the mintmark.

Coin is 19mm and 2.6g per seller.

Obverse: FL HELENA AVGVSTA
Draped and diademed bust facing right with necklace

Reverse: SECVRITAS REIPVBLICE
Securitas standing left, holding branch in right hand and raising hem of robe with left hand

In ex: SMK(Epsilon) or SMH(Epsilon)?

Obverse has a small spot on her right shoulder that gives me a bit of pause...