Not a RPM. That is from a damaged mintmark punch. When you compare it with other mintmark examples that year, you will see it happened a lot with a damaged punch.
http://www.varietyvista.com/05%20JN...%201973S.htm
Note all the RPMs listed that year has the mintmark punch damage. That is not part of the RPMs.
http://www.varietyvista.com/05%20JN...%201973S.htm
Note all the RPMs listed that year has the mintmark punch damage. That is not part of the RPMs.





















