They were hand punched into the dies until 1990 when it is part of the design. So they can vary in locations. That is a good thing as they locations of the mintmarks could be used for ID-ing the doubled dies and RPMs easier. So after 1990, there are no more RPMs. If the mintmark is doubled after that year, then it is part of a doubled die. IE 1995-D DDO-003: Note the lower serif on the mintmark. It is part of the DDO. (Not a RPM after 1990)
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