Nice find...are you 100% certain that it's copper?
Was there crustiness when you dug it or did it pop out looking like this?
Not much to go on... Just based on shape and size it could be a 17th C Spanish 8 maravedis.
Can you provide the size of the object with a scale or ruler..
Weight and specific gravity would be very useful as well....
Can you provide the size of the object with a scale or ruler..
Weight and specific gravity would be very useful as well....
View attachment 1929728
Could be this coin