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I think electric box knockouts are more the size just larger than a nickel. That one is larger than the quarter. TTCElectric box knockout?
I have one similar that is holed. Big chunk corroded off too. I found mine in downtown Pueblo where they were digging up a parking lot. I was thinking Spanish copper. My find is way too corroded to ever be sure. Soil isn't very kind here. Can you soak it to get any details?
I think electric box knockouts are more the size just larger than a nickel. That one is larger than the quarter. TTC
It appears to have green oxidation meaning it is either copper or brass. I don't recall electrical boxes being made from brass or copper so I would rule that out. I'm thinking either an early copper coin or large flat button. Tough to see in the one pic if that is a scar in the center where the shank would have been attached.
Once you get the rough crust off, rubbing a little 3 in one oil on it and holding it at an angle to the light might bring out some detail if there is any. Problem is a lot of early coppers were very pocket worn before being lost so you have an uphill battle getting an ID on them sometimes.