Sorry, Steve, missed your question. I am not sure, but, boy it really does look like an eye on the prow of my Semuncia... "Great eye" for seeing that!
Man, I love that series...I told ancientcoinguru that I have one in-bound, and should be here this week!
Just got it today! Roman Repulic AE Semuncia Turreted Female Bust Horseman - ROMA 217-215 BCE Crawford 39/5