Sorry. That is Machine Doubling. How can I tell? Note that area compared with the top loop of the mint mark. You can see where the Machine Doubling reduced the size of that area of the mint mark. The area below the MD is showing what the original mint mark looked like, before it was reduced by MD. So it is not a RPM. But it is still a silver dime, so don't spend it for face value. It is worth a lot more in silver melt.
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