Got this 1968 mint set with possible DDO/R on at least the 1968-S penny and maybe on one or more of the other pennies. So want your opinions. If you look closely at the pics, you can see pretty much the whole outline on Lincoln's face has what appears to be doubling. There is a small on the E in LIBERTY, around the top of AMERICA, the columns in the memorial and CENT and ONE and on UNITED. The P penny looks to have some of the same characteristics as the S but not to the same extent as the S.