Coin???

[Kapidr]

These were found recently while detecting my back yard. I showed the other in another post as I was looking to ID it but now I'm wondering about the big one? Is that a coin? What type? Why is the hold on the side? Any information would be helpful. Thanks!

Sorry for the duplication, please delete one? Not sure how I did that.

 

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[Mackaydon]

Mexican 2 reales Carlos IV (IIII) 1790; assayer FM
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