Doubled dies refer to coins struck where the die itself had doubling on it due to the hubbing process used to make the die.
Machine Doubling happens if a die moves during a strike, or takes a little bounce. It can also happen as the coin is being ejected from a die after a strike.
Doubled dies and Machine Doubling are two different animals , so to speak, and the wording is not interchangeable. Machine Doubling is a common occurrence and while collected by some, there is no premium associated with it.
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