Yeah I see what you mean its not a control mark-that 'A' might be though-its different from the few other examples I've seen where
Athena Ilia is holding something up rather than leaning on something, as she is in my Corinthian helmeted
Athena variant.
*edit* actually I can make out the same 'distaff' on your coin in Athena's left hand that is in mine.