Note the top and bottoms of the 'S' are affected. (Those area are reduced by Machine Doubling) There are two listed RPMs for 1971-S, none on the rest of the series. But check to see what a real RPM looks like on them: http://www.varietyvista.com/13%20Ei...%201971S.htm Note them on the fields? In order to be a RPM, there would have to be evidence of a spread on the punchings or like on these one listed on V.V, the are on the fields. So an enlarged mintmark or MD example, are not a RPM. There needs to be a spread on the punching that enlarges or leave evidence of a secondary punching. Example: 1955-S RPM-001: 1959D-1MM-009: Did you note the RPMs?
An enlarged mintmark is not a RPM: Why not? There is not evidence of a spread on the mintmark. The punching was done, made it larger, but no spread. Hope this helps.
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