I would like a lesson on how to distinguish between a coin with MD & one with an RPM. I find this very hard to do. I understand the distinction between a double die and Machine Doubling but my example poses some additional challenges.
Plus, what are those two (maybe even three) small protrusions at between 6 to 9 o'clock on the upright D? I would not bother asking if there was only one of these things...
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