Haven't had A RPM in a long time. This 1964 D is a well worn coin. There is a secondary mint mark going north from the primary. There are a ton of 1964 D's out there so It is not unique. Regards all.
I see Machine Doubling. The is no punching on the mintmark punch twice on this coin. Just Machine Doubling. Check other areas on the coin and you could see this on other areas of the coin.
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