yup, you're right, no rim. I noticed this before and thought that being black planchets don't have rims if it was caused by two entering the press the reverse wouldn't have the rim. Although I just held the lincoln next to a normal lincoln and the one missing the reverse seems thinner. When I rolled them the entire thickness was about as thick as the thinnest edge of the normal cent, if that makes any sense. Sorry about not posting pictures, but I didn't want to go through the trouble if this is obviously PMD
and mint error missing reverse cents just plain do not exist.