Greek AOE coin? Real? Value?

Hi there, I inherited this coin from my dad who got it from his father in Britain. I am wondering whether this coin is real or not and if so how much it might be worth and even possibly where it could be sold. It is very heavy, weighing about 18 grams, and I’m not sure about why there is a small chunk that seems to have maybe been gouged from the center of the owl. Any help/info you could provide would be great thanks!
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That's an Athens Owl from ancient Greece. It is made out of silver and the denomination is tetradrachm. The one in my picture sold for $2000 US dollars during a 2022 auction.
Your coin has been heavily damaged, with scrapings on Athena's face and a big gouge in the owl. This damage lowers the value substantially. My guess is that you could sell your coin for about $800.
For details about selling, see this page: