Recently I've been picking up some coins that have not been easy to attribute, and this type appears to have caused some disagreement amongst the academics. The coin was listed as "Methymna (?) - Lesbos. 330-280 BC".
I did find a few similar coins online listed as Methymna, with what is thought to be Hera on the obverse and the thunderbolt with grapes below on the reverse, but what is confusing is the legend "AIOΛE" above the thunderbolt. These coins with almost identical designs were all in the 14mm to 17mm diameter range, whereas this one is only 9mm in diameter. One of the coins on the Wildwinds "Browsing Ancient Coinage of Lesbos" page, has "Lesbos, struck in Aeolis for circulation in Lesbos. 330-280 BC. AE15," in the description.
A search brought up the publication, PHILIA, International Journal of Ancient Mediterranean Studies - "A Phantom City in the Troad: Aioleion and its Coinage". It has been a great help in trying to attribute the coin, and some of the pertinent information is reproduced below.

Image 1 - The abstract.

Image 2 - There is no city named Aioleion.

Image 3 - Coins found between 1981 and 2015, where a 9mm coin is mentioned.

Methymna (?) - Lesbos. 330-280 BC.
Obverse: Female head (Hera ?) right, wearing stephane, earring, and necklace. Reverse: Thunderbolt; grapes below. Reverse Inscription: AIOΛE. Metal: Bronze. Weight: 0.6 gr. Diameter: 9 mm.
Reference: BMC p.171, 6