If you double click the photo then enlarge it isnt just part of the UNIT its the entire letter, its hard to tell from the reflection because the coins glare.
Notice on the DDR image the second impression is the same height or very close to it, and on the MDD it is step like where the second impression is lower, like a step. the one you posted has a step like appearance
Sorry, Frank, but it's machine doubling.........flat and shelf-like. Keep looking, though! You'll find a true doubled die sooner or later. Chris