We're going to need more information. If you can't post a pic can you describe what else is on the coin? Is there a portrait on one side? Are there any other words?
It might not be a coin. It could be bullion or a token.
There were many revolts in Brazil in the 1808-1835 period and many 'states' counter marked previous issues to indicate a different denominational value as well as some that were counter marked for political purposes.
Without a photo of what you have, I can't narrow down what you might have found.
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