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Was thinking it may be a thin planchet at the end of the roll of copper. Any chance of that.
No chance at all. Notice the complete lack of a rim, not only is the coin thin but the diameter is smaller as well and the rim is gone. That only happens when the coin gets a nice soak in something acidic. Even a bath in a glass of Coke will do that, it does not need to be a strong acid. Only worth face value since it is post-mint damage.