Not an RPM, can't remember exactly when but they were stopped back in the 1980's I think. RPM occur due to the MM was hand punched, Now they are added to the die when the design is added.
Last year for RPM's was 1989, so after that year, it's impossible to have an RPM. I think what you're seeing is Split Plating. https://www.error-ref.com/split-plating/
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