It is, unfortunately, a replica of a silver "owl" tetradrachm from ancient Athens. Apart from exactly matching an example in the FORVM fakes database (https://www.forumancientcoins.com/fakes/displayimage.php?pid=11406), there are numerous other indicators that point towards it being fake.
Feel free to get it tested by a jeweller, but it probably isn't actually made of silver.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis