I think I see something here but I can't find a good match on coppercoins. What do y'all think(besides the fact that picture sucks...)
I second the skeptic of a RPM. I assume you are looking at the left vertical of the 'D' being the main factor, but if that back bar was repunched that strongly, there would be a corresponding curvature or at least a thickening in the front part of the 'D'.
Here is where I'm seeing what I thought may be the repunched part. It looks to be slightly rotated to me.
Location looks very close too. http://www.coppercoins.com/lincoln/diestate.php?date=1960&die_id=1960d1mm002&die_state=mds
The LDS photos show north/south die scratches in front of Lincoln. http://www.coppercoins.com/lincoln/diestate.php?date=1960&die_id=1960d1mm002&die_state=lds
Check the width of the back vertical of the "D" with the curve front. Since the same mm punch was used. and there doesn't appear to have rotation, why is the back so much thicker?