Not quite sure why this area did not strike up like the rest of the designs (still a little weak in other areas as well) the mint mark looks a little distorted, could be from being clogged with debris, grease etc. but it does not have the characteristics of the classic sense of machine doubling.
You have to think backwards when looking at strike through, wire or hair will leave an incused mark (indented) on the coin, so a raised area on a coin means a deeper area on the die has occurred, like say a die chip. Rare instances where a wire or other debris will be embedded into a coins surface, but it does happen. The raised area on the "D" means a lower die gouge or something to that effect....also note that the Schuler press can spit out 750 of these coins per minute, they look for quality, but quantity is what they want. By the billions.
