Pass my coffee. This one is interesting as there is no known RPM match. I see Machine Doubling to the west, and then what looks like additional doubling to the south, separate from the MD... Could it just be a combination of MD & DDD?
It is definitely odd because the bottom is so thickened. All three mint marks for 1954-D have a relatively open interior. I will say, to my recollection, any DDD on a vintage nickel mint mark usually moves towards the rim, or occasionally towards the building.
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