I have this bronze plate someone gave me and it looks ancient and like it came from the Greco Roman times. How much would it be worth?

Update: Around the plate is the cosmic thunderbolt that Zeus held in his hand and it's decoarated all over the plate. The plate shows a man wrestling with bull while a warrior looks like he's admonishing the man who's wrestling the bull. ]It's not plated copper because it doesn't lose it's color... show more Around the plate is the cosmic thunderbolt that Zeus held in his hand and it's decoarated all over the plate. The plate shows a man wrestling with bull while a warrior looks like he's admonishing the man who's wrestling the bull.

]It's not plated copper because it doesn't lose it's color when scratched.
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