Looks like an inny not an outty. I am sure someone will come along and let you know whats up with this mint mark. I am here to learn as you probably are as well. I also would like to know this answer
Machine Doubling is caused by the mechanical part of the minting process. The die could "chatter" a little during a strike. It could bounce a little. It could twist a little. These things actually shear the metal and push the metal around a little bit. When you look at the details, they appear doubled. The doubling is flat and shelf like.
Die doubling is actual doubling or tripling or quadrupling that occurs during the process of making hubs or dies with the result being doubling that is actually a part of the die itself. With a few exceptions, the doubling is rounded and there is separation of the images. There are many "doubled dies" where the spread is very close but the differences between the shelf like doubling and the rounded doubling seen on coins struck by doubled dies is still identifiable and evident.
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