Doubled Dies vs Machine Doubling

NGC article: https://www.ngccoin.com/news/article/...
Error-Ref doubled dies: https://www.error-ref.com/doubled-dies/
Error-Ref machine doubling: https://www.error-ref.com/machine-dou...
PCGS articles: https://www.pcgs.com/news/counterfeit...
https://www.pcgs.com/news/collecting-...

Drawing by Charles D Daughtrey of Coppercoins: https://www.coppercoins.com

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