This is a silver tetradrachm from the city of ancient Athens, c.480 BC. The original is in the British Museum. The owl is the symbol of the patron goddess of the city of Athens – Athena – and the bird appears on a lot of the coins from the time period.
And the owls are ALL depicted with the same wide, round eyes. Kind of looks like it’s judging you, no? You can see more examples of coins here: Google Images ‘Owls of Athens Coins.
Quoting from Wikipedia, Athena was the goddess of: “wisdom, courage, inspiration, civilization, law and justice, just warfare, mathematics, strength, strategy, the arts, crafts, and skill”. No biggie. Just those few things.