Have a Scott 68 on cover and another off cover with what appears to be residual ink in the upper margin. Posted images of a few Scott 68 without this feature for comparison. If the excess ink is the result of a plate that wasn't properly cleaned between printings I imagine ink would be found elsewhere on the stamp and not limited to just the top margin. I'm not sure if this is excess ink or a printing flaw of some other type. Any opinions appreciated.