Cool coin and writeup, @kirispupis!
This isn't my core collecting area, but like you, I am fascinated by these coins and their history. I also recently acquired a coin from the Hera mint, a hemidrachm that's also relatively well worn, but still in decent enough condition so that both reverse and obverse are recognizable (seller's pics - because I suck at photography). I had a chance much earlier to acquire another one, but missed out, so I was determined to get this one.
Elis, Olympia 336-324 BC, Hemidrachm (111-114th Olympiad)
Obv: Head of nymph Olympia left.Rev: Eagle standing left, "FA" above (not visible on my coin) and grape bunch on a vine to right.BCD Olympia 195 (same dies)