Hi Just4, Based on the considerable wear and the fact that the rims appear complete, I'd say about Fine-12. I don't know this series, although I'm guessing this 4-reales denomination is probably more scarce than the 8-reales.
You might post this on the World Coin forum to attract more expert opinions. Many of these coins have been counterfeited at one time or another and it would be nice if one of our world coin experts could offer their judgement on authenticity.
As far as I can tell, it looks like a nice, original coin with no serious problems.
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