I am looking at
Lianta but a color version of the photos, the three indicators I was using to attribute was it is AE, has a full circular
legend and the stars by the emperors
head, Also he has no design on
his chest, again I could not make out anything on the
reverse ( or might be
obverse.)
My idea was something like
Lianta 1006 18mm 2.15gm , the others listed seem to be 15mm but
weight around 2.gm , your coin is smaller and light like a follaro. I saw no match for either ruler.