Above is but one example of a so-called "Poor Man's 1955 Double Die". The coin is not a double die but rather a very common abraded die doubling of the last digit and other examples can be found for other dates in the series. It is in no way related to the rare 1955 Double Die mint errors and should be regarded as any common cent with a normal strike. Any coin with abraded die doubling has no extra value.
I place "Machine" Doubling in a class by itself because it's such a common occurrence that many show up at ebay as true Double Dies. It's far from the truth. The true cause of a Double Die has nothing to do with any type of "Machine" Doubling, and is so common, that it adds no extra value to most coins.
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