Strange Maravedis?

I ddug this last July and thought it was a slug or something until I cleaned it a little. The reverse is just like the CarlosIII maravedis, but the obverse does not have a Bust, but a shield or coat of arms and the two spots at the top resemble chop marks. This coin is not in any book or internet from the U.S. to Spain. This thing is making me

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