Aigae Aeolis Ae : Apollo / Head of Goat ; Unusually Small

Aigae Aeolis Ae; circa 3rd Century BC

Obv: Laureate head of Apollo right

Rev: Head of goat right; AIGAE to left

A nice coin in hand but it is smaller and lighter than any other example I could find. The smallest examples normally run 10mm and 1.5gms but this piece is 8mm and 0.7gms. A different denomination?