RPMs stopped in 1989. Starting in 1990, all mintmarks are part of the design. No longer punched. Looks like Machine Doubling. The area in question is flattened. A RPM is usually raised above the field.
Machine Doubling on the mintmark. Not an RPM, as they stopped happening in 1990. You might want to do more research on RPM's, in your spare time. http://www.varietyvista.com
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