Spent a couple of hours trying to figure this out. I found this '56D Lincoln in my 50 year box. It has a double eye lid, but it's on top of the normal lid. The 9 in the date looks to have doubling, the D looks doubled and BERTY looks doubled to me as well. It doesn't fit any DDO's and the closest RPM seems to be RPM-011. Am I on track, or way off base? Thanks: Lou Lou