One of the easiest ways to tell MD from a real DDO (if the coin has a MM) is to look at the mintmark. If the mintmark has the same doubling direction as the date and other devices, it is almost surely MD.
Quote: One of the easiest ways to tell MD from a real DDO (if the coin has a MM) is to look at the mintmark. If the mintmark has the same doubling direction as the date and other devices, it is almost surely MD.
That's true up till 1990 when the MM was added to the master die. John1
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