Machine Doubling is very common on coins. Some save them, others release them back into the wild. I save a few for educational purposes when they are real extreme. The strongest so far has been on a proof cent.
https://www.coincommunity.com/forum...VICES_01.jpg
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https://www.coincommunity.com/forum...VICES_01.jpg
https://www.coincommunity.com/forum...VICES_02.jpg
https://www.coincommunity.com/forum...VICES_03.jpg
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