Yes the wife found it interesting and thought I should have a look. Of course I assured her it was md . (Kidding)
Maybe you have something although this example shows more doubling: https://www.usacoinbook.com/coins/4...t/1960-D/d-over-d-small-date-over-large-date/
Also a double post. Philly made proofs in 1960. https://www.usacoinbook.com/coins/497/small-cents/lincoln-memorial-cent/1960-D/d-over-d-small-date-over-large-date/
Looks like MD from the photos provided. Oddly, came up a few days ago in different thread This how the coin described DDO, sm ( red line)/lg ( blue line), wRPM ( green pointers) Close up of Jim